3.5mm AUX Bluetooth Transmitter Receiver: In the Transmitter(Tx) mode, the Bluetooth adapter solves the problem of TV/treadmill/airplane not being able to connect to Bluetooth speakers/headphones, no more worrying about not being able to enjoy wireless music. In receive(Rx) mode, you can plug it into the car AUX port and pair it with your cell phone/tablet, listen to songs, navigate, and make hands-free calls all in one.LED Display Screen: The Bluetooth transmitter receiver equipped LED digital display clearly shows the volume, pairing status, and pairing mode (TX/RX), plus, the Bluetooth adapter will display the name of the paired device for selection, making operation more intuitive & convenient.Plug & Play, Easy to Use: Featuring Bluetooth 5.4 chips for improved signal transmission, connect with your devices in seconds, support 33ft distance stable and smooth wireless music transmission. You can easily switch the Bluetooth mode between Bluetooth transmitter/Bluetooth receiver, then just pair and connect with the device to enjoy wireless music.Built-in Battery & Portable for Travel: This Bluetooth transmitter receiver is super mini size, and bulit-in battery. Use the Type-C interface to charge it for 11 hours of continuous use, and play while charging for added convenience. Size: 1.5*0.6*0.27inches.Wide Compatibility: This Bluetooth audio Transmitter receiver allows you to enjoy seamless compatibility with wired speakers/headphones, home stereo systems, car stereo systems, PCs, projectors, MP3/MP4 players, airplane in-flight entertainment systems, TVs, treadmills, Bluetooth headphones/earbuds, and other audio streaming sound systems.