A:Answer Heather - The the actual operating range of the VTech DS6151 may vary depending on the environmental conditions and other interferences such as walls, doors and other obstructions. Adding cordless handsets to the system will not extend the range. For more details, you can contact our Customer Support at 1-800-595-9511. We are open from 9:00 AM to 3:00 PM, Mondays through Fridays.
Thank you,
-VTech Support