A:Answer Hello GGMC! The receiver with the orange Logitech symbol is what we call a Logitech Unifying Receiver. And you're in luck, because this receiver is compatible with the K350 Wireless Keyboard. Now to pair the Unifying Receiver to your keyboard, you'll have to go online and download the free Logitech Unifying Software, which can be found here: https://support.logi.com/hc/en-us/articles/360025297913-Logitech-Unifying-Software Once that's done, install the software, and follow the on-screen instructions to complete the pairing. - Mathieu from Logitech