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Best Buy customers often prefer the following products when searching for Warning Alarms.

A warning alarm is a device that alerts you to danger or an event before it occurs. These alarms are often used in industrial settings, but they can also be used to alert you to a fire, an intruder, or other emergencies. Browse the top-ranked list of warning alarms below along with associated reviews and opinions.

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  1. Night Owl - 12-Channel, 8-Camera Dome Indoor/Outdoor Wired 2K 2TB DVR Security System with 2-Way Audio - Black/White - Front_Zoom

    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
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    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
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    Your price for this item is $493.99
    Save $6
    The comparable value price is $499.99
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  2. Night Owl - 2-Channel, 4-Camera Dome Indoor/Outdoor Wired 2K 2TB DVR Security System with 2-Way Audio - Black/White - Front_Zoom

    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
    See all Home Security Systems

    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
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    Your price for this item is $379.99
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  3. Night Owl - 20-Channel, 12-Camera Indoor/Outdoor Wired 4K 2TB DVR Security System with 2-Way Audio - Black/White - Front_Zoom

    Product Description

    When life gets hard, make your security easy. Introducing our new 4K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 4K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
    See all Home Security Systems

    Product Description

    When life gets hard, make your security easy. Introducing our new 4K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 4K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
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    Your price for this item is $999.99
    See all Home Security Systems
  4. Night Owl - 12-Channel, 6-Camera Dome Indoor/Outdoor Wired 2K 2TB DVR Security System with 2-Way Audio - Black/White - Front_Zoom

    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
    See all Home Security Systems

    Product Description

    When life gets hard, make your security easy. Introducing our new 2K 2-Way Audio DVR Security System. With secure app-based Bluetooth setup, there is no need to connect a TV or monitor for setup or viewing (optional). Easily set up the system right from the convenience of your mobile device. Your 2K cameras have full-color day viewing and full-color night vision up to 100 ft., which provides colorful recordings that capture every detail. With a bright built-in spotlight, you can light up the dark and ward off unwanted guests. For situations where seeing is not enough, easily make your voice heard. With 2-way audio you can listen and talk with anyone who approaches, making your presence known. Still not enough? Use our preset voice alerts and booming camera siren to shout a warning when a suspicious stranger nears. You will receive key alerts to your mobile device for important matters, such as people and vehicles as they arrive and depart. All recordings and personal data are privately stored on the recorder’s hard drive for secure access with zero costs. Your privacy matters and your recordings and for your eyes only. Built for outdoor use, your cameras can handle anything mother nature throws their way, from extreme heat and cold, to rain or sleet. Use them indoors or outdoors to cover what you want, when you want. Need more coverage? Easily add our compatible wired, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. This system is a one-time purchase and there are no hidden costs. Use our free mobile app for iOS and Android Smart Devices to stay connected and easily access your recordings with no fees.
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    Your price for this item is $449.99
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  5. SimpliSafe - Smoke Detector - White - Front_Zoom

    Model: SSSD3
    SKU: 6520590
    Top comment

    "Make sure you click it all the way or youll get alarms that their tampered with...These alarms work very well with the simplisafe system!"

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    Product Description

    Protect your home and family from fires with the SimpliSafe Smoke Detector that's fully connected to your SimpliSafe Home Security System. You’ll get an instant alert sent to your phone when dangerous levels of smoke are detected. Plus, with a 24/7 Professional Monitoring Plan, the smoke detector alerts our monitoring center in an emergency. That means you’ll get a fast response from firefighters.
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    Top comment

    "Make sure you click it all the way or youll get alarms that their tampered with...These alarms work very well with the simplisafe system!"

    See all customer reviews

    Product Description

    Protect your home and family from fires with the SimpliSafe Smoke Detector that's fully connected to your SimpliSafe Home Security System. You’ll get an instant alert sent to your phone when dangerous levels of smoke are detected. Plus, with a 24/7 Professional Monitoring Plan, the smoke detector alerts our monitoring center in an emergency. That means you’ll get a fast response from firefighters.
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    Your price for this item is $44.99
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  6. Swann - AllSecure 4K Wireless Security System w/ 3 Wire-Free Cameras, No Monthly Fees, Local Storage, 2-Way Audio, Night Vision - White - Front_Zoom
    Top comment

    "Each camera is equipped with spotlight and an ear splitting siren that can be set to activate on motion, thankfully the system warns you when you go to activate it, so you shouldn’t accidentally turn it on. ...This feature reduces false alarms and ensures that you are notified only of relevant activity. "

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    Product Description

    Swann's AllSecure4K+ Wireless Security System is always charged and always secure. The 100% wireless cameras setup in minutes using rechargeable battery power and offering crystal clear 4K color video day and night. Actively prevent unwanted activity with True Detect heat and motion-sensing to trigger recording, spotlights, sirens and mobile alerts. Engage in two-way talk, see what’s happening, arm and disarm the system using the Swann Security app. The 4K+ Power Hub has a charging bay, and a spare battery ensuring there is never any ‘downtime’ - just hot swap the batteries to and from the cameras as needed. The spare battery also provides back-up power to the Hub for up to 5 hours in the event of an onsite power outage. Retain up to 2 years of clips at any time on the Hub’s large 1TB local hard drive plus cloud backup. Recording is always free and there are no monthly fees. The system is also expandable as you can connect up to 8 cameras to the 4K+ Power Hub if needed. There’s also offline mode, with the option to view on a TV or monitor and record without internet.
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    Top comment

    "Each camera is equipped with spotlight and an ear splitting siren that can be set to activate on motion, thankfully the system warns you when you go to activate it, so you shouldn’t accidentally turn it on. ...This feature reduces false alarms and ensures that you are notified only of relevant activity. "

    See all customer reviews

    Product Description

    Swann's AllSecure4K+ Wireless Security System is always charged and always secure. The 100% wireless cameras setup in minutes using rechargeable battery power and offering crystal clear 4K color video day and night. Actively prevent unwanted activity with True Detect heat and motion-sensing to trigger recording, spotlights, sirens and mobile alerts. Engage in two-way talk, see what’s happening, arm and disarm the system using the Swann Security app. The 4K+ Power Hub has a charging bay, and a spare battery ensuring there is never any ‘downtime’ - just hot swap the batteries to and from the cameras as needed. The spare battery also provides back-up power to the Hub for up to 5 hours in the event of an onsite power outage. Retain up to 2 years of clips at any time on the Hub’s large 1TB local hard drive plus cloud backup. Recording is always free and there are no monthly fees. The system is also expandable as you can connect up to 8 cameras to the 4K+ Power Hub if needed. There’s also offline mode, with the option to view on a TV or monitor and record without internet.
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    Your price for this item is $499.99
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  7. SimpliSafe - Wireless Auxiliary Siren - White - Front_Zoom
    Top comment

    "Love this addition to my alarm system. Helps with alerting me when the alarm is triggered....Perfect for scaring off intruders and warning your loved ones."

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    Product Description

    Protect your home from break-ins with this SimpliSafe auxiliary siren. It emits a 105dB alarm to alert burglars that the police are on their way, and it comes programmed to work with SimpliSafe systems for minimal setup. This SimpliSafe auxiliary siren is weatherized for installation indoors or in sheltered areas outdoors.
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    Top comment

    "Love this addition to my alarm system. Helps with alerting me when the alarm is triggered....Perfect for scaring off intruders and warning your loved ones."

    See all customer reviews

    Product Description

    Protect your home from break-ins with this SimpliSafe auxiliary siren. It emits a 105dB alarm to alert burglars that the police are on their way, and it comes programmed to work with SimpliSafe systems for minimal setup. This SimpliSafe auxiliary siren is weatherized for installation indoors or in sheltered areas outdoors.
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    Your price for this item is $59.99
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  8. Ring - Alarm Glass Break Sensor (2-Pack) - White - Front_Zoom
    Top comment

    "I really like the Ring glass alarm; it works very well when I drop a metal bowl or make any loud sound like glasses, the alarm is on right away....They connected to the alarm easily."

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    Product Description

    Monitor glass windows and doors for break-in attempts with Ring Alarm Glass Break Sensor. Using AI technology, the sensor detects the sound of glass breaking up to 25 feet. You’ll receive notifications whenever breaking glass is detected, or receive a call from our monitoring center if you have enrolled in professional monitoring* with a Ring Protect Pro subscription, sold separately.** Requires Ring Alarm or Ring Alarm Pro, both sold separately.
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    Top comment

    "I really like the Ring glass alarm; it works very well when I drop a metal bowl or make any loud sound like glasses, the alarm is on right away....They connected to the alarm easily."

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    Product Description

    Monitor glass windows and doors for break-in attempts with Ring Alarm Glass Break Sensor. Using AI technology, the sensor detects the sound of glass breaking up to 25 feet. You’ll receive notifications whenever breaking glass is detected, or receive a call from our monitoring center if you have enrolled in professional monitoring* with a Ring Protect Pro subscription, sold separately.** Requires Ring Alarm or Ring Alarm Pro, both sold separately.
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    Your price for this item is $69.99
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  9. SimpliSafe - 4pack Entry Sensor - White - Front_Zoom
    Top comment

    "This can’t be cleared from the app, it has to be cleared from the keypad. As it warns you that a door is opened when setting it away mode or home....Purchased my mom a alarm system and she needed a couple extra entry alarms and best buy was cheaper then buying off there website. "

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    Product Description

    Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap.
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    Top comment

    "This can’t be cleared from the app, it has to be cleared from the keypad. As it warns you that a door is opened when setting it away mode or home....Purchased my mom a alarm system and she needed a couple extra entry alarms and best buy was cheaper then buying off there website. "

    See all customer reviews

    Product Description

    Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap.
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    Your price for this item is $49.99
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  10. Ring - Alarm Panic Button (2nd Gen) - White - Front_Zoom

    Model: B09NXDQ5YM
    SKU: 6521445

    Product Description

    Sound the alarm, notify loved ones*, and request emergency help when you need it with Alarm Panic Button (subscription required, sold separately). You can press and hold the Panic Button for three seconds to sound the siren on your Ring Alarm. Subscribe to Ring Protect, sold separately, to also alert shared users when your Panic Button is pressed with notifications from the Ring App.* Opt into 24/7 Professional Monitoring with a Ring Protect Pro subscription, sold separately, to notify our monitoring center and request emergency responders when your Panic Button is pressed.** BATTERY WARNING: KEEP OUT OF REACH OF CHILDREN. Store spare batteries securely. Dispose of used batteries immediately and safely. If you think batteries might have been swallowed or placed inside any part of the body, seek immediate medical attention.
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    Product Description

    Sound the alarm, notify loved ones*, and request emergency help when you need it with Alarm Panic Button (subscription required, sold separately). You can press and hold the Panic Button for three seconds to sound the siren on your Ring Alarm. Subscribe to Ring Protect, sold separately, to also alert shared users when your Panic Button is pressed with notifications from the Ring App.* Opt into 24/7 Professional Monitoring with a Ring Protect Pro subscription, sold separately, to notify our monitoring center and request emergency responders when your Panic Button is pressed.** BATTERY WARNING: KEEP OUT OF REACH OF CHILDREN. Store spare batteries securely. Dispose of used batteries immediately and safely. If you think batteries might have been swallowed or placed inside any part of the body, seek immediate medical attention.
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    Your price for this item is $29.99
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