1Low Latency APTX: Bluetooth transmitter with built in high end chip, lossless sound quality, low latency and high compatibility. And with aptX Adaptive,aptX HD,aptX LL,aptX,SBC codec to achieve excellent sound and low latency. 2Bluetooth 2 Technology: Bluetooth 2 adapter is designed with the latest bluetooth 2 technology, transmitting twice as fast as older bluetooth versions to provide more stable wireless for your devices. 3Dual Mode, Dual Connection: Bluetooth transmitter receiver supports TX mode and RX mode, TX mode supports connecting two headsets at the same time, RX mode supports connecting two cell phones. 4Widely Used: Bluetooth 2 adapter can easily add bluetooth to your car sound system, home stereo, speakers, wired headphones, etc. via 5 mm AUX plug. 5Plug and Play: bluetooth transmitter receiver is plug and play, easy to set up, one button operation, clear LED status indicator to see the connection status at a glance. 6Long Standby Time: Bluetooth transmitter receiver working time is RX>20H, TX>12H, support charging while using, no need to worry about the power.