1. BLUETOOTH COMPATIBLE: This audio Bluetooth adapter support 3.5mm aux audio, and also compatible with all smartphones, bluetooth audio devices (Bluetooth headphones, Bluetooth speakers and much more), and stereo equipment with audio input port. By pressing the button on the center front, the receiver & transmitter device will start to pair to the next Bluetooth device. 2. TRANSMITTER RECEIVER MODE: 2in1 design, by using this wireless adapter, you can send and receive all of the audio freely and easily. Transmitter enables your TV, AV Receiver, Radio and other home audio source devices to stream music to your Bluetooth headphones or speakers; Receiver lets non-Bluetooth devices like your home stereo or AV Receiver and wirelessly stream music from your cellphone/PC. 3. CLEAR SOUND: A2DP support voice prompts, gets high-quality audio sound, offers you 30 feet operation range with good performance, gives you a good experience when answering the phone or watching late-night shows. In order to get clear sound, we recommend NOT using the 3.5mm Bluetooth transmitter-receiver while charging. 4. WIRELESS FUNCTION: Want to watch football/baseball / Boxing / Golf / NBA game late at night without waking anyone up? This is a great chose for you. Bluetooth transmitter function wirelessly streams audio to Bluetooth speakers or headphones from your TV or older media devices like portable CD players that lack built-in Bluetooth. Product Name:2-in-1 audio adapter Product model:BT-22A Wireless version:Wireless 5.3 Transmission distance:10 meters Power supply method:Type-C interface Product size:60mm x 22mm x 17.5mm (approximately) Basic functions:Wireless audio receiver/transmitter Battery life:Approximately 6.5hours for transmitter/6.5 hours for receiver Colour:Black Material:ABS Package Contents: 1 * Bluetooth Transmitter Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.