[Easy To Use] Receive (RX) signal and transmit (TX) signal in one, one key switch, applicable to a variety of devices, plug and play. Compatible with for windows 8 8.1 10 etc, no need to install driver. [Speaker Upgrade] 3.5mm AUX sound adapter can be connected to ordinary speakers, so that your wired speakers become wireless, stereo amplified playback, providing shocking sound. [High Performance] Equipped with strong performance BT 5.1 chip, transmission is clear and stable, no lag and disconnection, 15 meters barrier free transmission distance, large signal coverage. [Hands Free Call] BT sound receiver transmitter built in microphone, hands free amplification of clear calls, so that your hands do not need to leave the steering wheel, safer driving. [Car Use] Use the sound receiver transmitter to turn the car speaker into a BT speaker, start with the car, automatically back to connect, enjoy the cell phone music, HD voice navigation broadcast.