Bluetooth Receiver and TransmitterBluetooth 2 in 1 gives TX/RX modes. With TX mode, it can transfer audio from your Bluetooth-incompatible TV to your Bluetooth devices, such as a transmission headset. With RX mode, it can be audio from your Bluetooth devices, such as transferring a phone to a stereo device that turns Bluetooth off. If you want to change the mode, you don't need to power off the device. Bluetooth Hands-free CallingIn receiving mode, this product supports Bluetooth hands-free calling. When a call comes in, press the multifunction key to answer the call; During a call, press the multifunction key to hang up; Once connected, double-click the multi-function key to redial when the call ends. Extensive CompatibilityBluetooth adapter with included 3.5mm and 3.5mm cables to 2RCA, this transceiver adapter can be widely used on your computer, laptop, home stereo, headphones, smartphone, MP3 player, CD player, etc. Automatic re-pairing Just press the switch, set it to the mode you want, 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 transceiver with wider compatibility, faster transfer speed, better sound quality. 250mA Lithium-ion Battery and Portable DesignAdopting the long-lasting 250mA lithium-ion battery, it can play continuously for more than 8 hours while fully charged in about 2 hours. Cable free use, the maximum wireless distance is 10 meters. the compact Bluetooth adapter is small, light and easy to carry. Bluetooth transmitter and receiver without external driver installation.