Features: Receive Transmitone Key Switch: Receive Rx signal and transmit TX signal are integrated.Free switching applicable to a variety of devices. Receiving Mode: Audio playback device connected with speakers to receive. Bluetooth-compatible signals and play music wirelessly. Launch Mode: Connect the audio output device transmit the Bluetooth-compatible signal and use the paired wireless headset Bluetooth-compatible audio playing music.Solve the problem that the TV cannot connect to the Bluetooth-compatible headset. Watching TV at night is not afraid to disturb your family. Receive Mode Onboard Connection: The car speaker changes into a Bluetooth-compatible speaker in seconds plug and play and automatically connects back. Enjoy mobile music and HD voice navigation broadcast. Hands-Free Call Built-in Microphone: Hands-Free communication hands on the steering wheel safer driving. Connect ordinary speakers break space restrictions and enjoy wireless convenience. Stereoscopic amplification shocking sound effect.