Using your Behringer BT251-BK Bluetooth wireless adapter is a breeze. First, make sure your device is Bluetooth-enabled and in pairing mode. Then, turn on the adapter and pair it with your device. Once paired, you can enjoy high-quality sound wirelessly. For phone calls, just answer the call as you normally would and the audio will come through the adapter. When it comes to battery life, you'll get up to 5 hours of non-stop listening. If the battery runs low, simply recharge it using the provided cable. To keep your adapter in top shape, avoid exposing it to extreme temperatures or moisture. Clean it gently with a soft, dry cloth. Also, when not in use, store it in a safe place to prevent any damage to the 360-degree rotating gold-plated MMCX lock-snap connector.