Bluetooth 5.3 and stable connection: The in-car auxiliary Bluetooth adapter can receive Bluetooth signals within a 10-meter range, enabling lossless music playback and stable call signals, allowing you to enjoy pleasant music while driving. It is suitable for cars, speakers, stereo audio systems and headphones. Ultra-long battery life: This Bluetooth 5.3 transmitter-receiver has an extremely long battery life. It has a built-in 300 mAh battery and can be used for 6 hours, with a standby time of 60 days. It can be charged via a USB port, and it only takes 2 hours to fully charge. It can be used normally while charging. The operation is simple and convenient. It plays music through Bluetooth connection. Just press the power button to play/pause music.