1. Wireless Transmitter and Receiver 2in1 Receiver Mode: Wirelessly transmit audio from BT-enabled mobile phones, tablets and computers to wired stereo speakers or headphones (only supports pairing with a BT receiver).Transmitter mode: Wirelessly stream audio from a non-BT TV, stereo or CD player to BT headphones or speakers. 2.33ft coverage and permanent work, 3.5mm auxiliary BT transmitter for TV with built-in antenna can reach 33ft coverage.You can lie on the sofa and watch a movie or walk around and listen to music.The battery supports 10 hours of service.Or work while charging and work forever. 3. If the BT5.0 transmitter/receiver is not paired with a device within 10 minutes, it will automatically shut down.It does not waste power and also effectively protects battery life. 4. This receiver transmitter adapter can be widely used in your computer, laptop, home stereo, headphones, smartphone, MP3 player, comes with 3.5mm cable and 3.5mm to 2RCA cable., CD player, etc. Low latency for HiFi stereo, delay-free content delivery in transmitter mode. 5. Keep your old stereo or wired headphones alive with the new wireless BT connection, pair with your smartphone or tablet up to 30 feet away and enjoy great wireless music.