Battery life will depend on actual usage and amplification levels. Pairing your CLA7BT to your Cellular Phone. “Pairing” Creates a link between devices equipped with Bluetooth wireless technology and the CLA7BT, and allows the phone to remember the Neckloop’s unique ID; you can add it to a list of paired devices in the phone. The CLA7BT should be paired once with the phone before use. If the pairing information or log is deleted from your phone, the unit must be paired again with the phone prior