3.5mm Aux Bluetooth Adapter: 2-in-1 bluetooth transmitter receiver supports bluetooth receiving and bluetooth transmitting, wireless call, music playback. Short press the multi-function key after power on to check the battery level in real time, long press the previous song key/next song key to adjust the volume and display the volume.Bluetooth 5.4 Technology: The Receiver & Transmitter delivers a faster, more stable connection and guarantees higher audio quality. Bluetooth 5.4 to enhance your smart life with wireless music and hands-free calls.Ease to Use: 3.5mm Bluetooth Adapter Plug it into your auxiliary (AUX) port, pair it, and you have receive and transmit functionality for all your Bluetooth needs. (RX) In Bluetooth Receiver Mode: The Bluetooth audio receiver streams music from Bluetooth devices to your home stereo/car stereo system. (TX) In Bluetooth Transmitter Mode: The Bluetooth transmitter streams audio from an aircraft/TV/computer to a Bluetooth headset.Widely Compatible: Bluetooth auxiliary adapter for car and home audio systems, compatible with most Bluetooth devices such as TVs, smartphones, tablets, laptops and computers, with 3.5 audio jacks devices.Rechargeable and Long Range: One button to switch on and enter pairing mode. Long built-in battery life, Type C port charging 2 hours, up to 14 hours of use on a full charge. The Bluetooth range up to 33ft without obstacles. Automatically connects to the last connected device.LED Digital Display: Another unique feature of this portable Bluetooth adapter is its LED display. Through it, we can know the exact power level. It also reminds us to charge it in time for uninterrupted music playback.