Clarity's XLC7BT offers all of the wonderful features of the XLC series phones above, with the additional ability to pair 2 Bluetooth devices, such as smart phones. This allows you to make or answer a cell phone call on your XLC Bluetooth phone, and receive all of the amplification benefits of the XLC. Download and store up to 1,000 contacts from your smartphone in your XLC7BT phone. A landline is not required if you only want to amplify mobile calls. Expandable up to 3 additional handsets.