Item Type: BT Receiver TransmitterMaterial: ABSBattery Type: Built in 180mAh Li Ion Battery (Included)BT Version: 5.1BT Transmission Distance: 15m/49.2ft Without ObstaclesBT Call: SupportInput and Output Mode: 3.5mm AUX Sound PlugApplicable Scenes: All Kinds of Speaker, Car, Computer, TV, Amplifier, etc.Package List1 x BT Receiver Transmitter1 x Charging Cable 1 x Instruction Manual 1[High Performance] Equipped with strong performance Bluetooth 5.1 chip, transmission is clear and stable, no lag and disconnection, 15 meters barrier free transmission distance, large signal coverage. 2[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. 3[Car Use] Use the sound receiver transmitter to turn the car speaker into a Bluetooth speaker, start with the car, automatically back to connect, enjoy the cell phone music, HD voice navigation broadcast. 4[Hands Free Call] Bluetooth 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. 5[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.