1. Transmitter + Receiver - Transmitter mode: transmit audio from non-Bluetooth audio sources (TV, PC, TV Box, CD / DVD player, projector, etc.) to Bluetooth headphones / speakers. Receiver mode: transmit audio from Bluetooth audio sources (smart phone, tablet, Bluetooth TV/PC, game machine, amplifier, etc.) to non-Bluetooth headphones / speakers / car / home stereo system.2. Optical + 3. 5mm - You get maximum flexibility with support for both digital optical jack and 3. 5mm audio jack(AUX and RCA), both audio input and output are supported. *The product can be used with X-Box (optical digital connection only).3. Low Delay - Built-in DSP, the Bluetooth audio adapter can reduce Bluetooth delay to provide CD-level high-fidelity stereo sound quality when you listen to music. Stream and control your music with a reliable connection range of up to 33ft(10m). *Operating range can be affected by multiple factors.4. Dual Link Music Streaming - Connect 2 Bluetooth headsets / speakers simultaneously to your TV to share the movie in transmitter mode, or pair 2 devices to your home stereo system to stream music in receiver mode at the same time. Automatically connect to your previously paired devices at power-up.5. USB Rechargeable Large Capacity Battery- The built-in 1200mAh battery can provide up to 8 hours of playback time in transmitter mode and 7 hours in receiver mode after about 2 hours charging. Support using while charging. With power indicator light, you can know the working status at any time, which is convenient for you to use.