【Bluetooth Receiver and Transmitter】 2 in 1 Bluetooth provides TX / RX modes. With TX mode, it can transfer the audio from your Bluetooth-incompatible TV to your Bluetooth devices, such as a transmitting headset. With RX mode, it can be the audio from your Bluetooth devices, such as transferring a phone to a stereo device that turns off Bluetooth. If you want to change the mode, you don't need to turn off the power.【Bluetooth Hands-free Calling】 In receiving mode, this product supports Bluetooth hands-free calling. When a call comes in, press the multi-function key to answer the call; During a call, press the multi-function key to hang up; Once connected, double-click the multi-function key to redial after the call ends.【Wide Compatibility】Bluetooth adapter with the included 3.5mm cables, this receiver transmitter adapter can be widely used on your computer, laptop, home stereo, headphones, smartphone, MP3 player, CD player, etc.【Auto Re-Pairing】Just press the switch, set it to the desired mode, you can quickly and easily establish a connection. An internal battery ensures that the bluetooth adapter can be used for up to 8 hours and immediately connects to already paired devices. bluetooth transmitter receiver with wider compatibility, faster transfer speed, better sound quality.