2 in 1 Transmitter and Receiver: The Bluetooth adapter combines Bluetooth audio transmitter and receiver in one with an 3.5 mm Aux jack. With the built-in latest Bluetooth 5.0 chip, our bluetooth transmitter receiver supports Low Latency, Low Latency for High-fidelity Stereo Sound, lag-free content streaming in transmitter mode. Hand Free Calling: A built-in microphone ,Just press the button to answer or hang up your phone calls while driving. Our aux bluetooth receiver adopts the Intelligent noise cancellation, providing you with crystal-clear calling sounds. You dont have to look down the phone on the move. Make sure you drive safely Plug and play : No need to drive and download APP, Bluetooth receiver just plug it in the aux port, turn on Bluetooth on your mobile, connect and play. Easy to pair and compatible with 99.9% Bluetooth devices. Up to 10 hours of Battery Life: 200mAh large capacity battery, 10 hours of continuous playback, power LED display, more convenient. Small compact design with light weight and portable carrying. Wide Compatibility: Support TF card, bluetooth 5.0 audio receiver is compatible with most of smartphones and bluetooth electronics, ideal for home or car audio system.The maximum distance is 12 meters.