Beyution 2-in-1 Portable Wireless Bluetooth Transmitter and Receiver with 3.5mm Audio Cable/RCA Cables Connected to TV & Paired with 2 Bluetooth Headphones At Once in TX Mode,Enjoy Stereo Music & Hand Simple one-button switch to shift between transmitter(TX) and receiver(RX) mode TX Mode: Plug into your Non-Bluetooth device and pair up your Bluetooth speaker or headset. RX Mode: Plug into your Non-Bluetooth speaker and pair up your Bluetooth phone or MP3 player. Bluetooth-enable all 3.5mm media devicesenable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, MP4, CD / DVD players, e-readers, TVs, Computers, PC and more. Built in battery for portable useBattery life for TX mode: about 8 hours; battery life for RX mode: about 6 hours. Charging time:1-2 hours. Bluetooth V3.0 Support profile: A2DP and AVRCP, stereo stream output, transmission distance range to 10 meters( about 33 feet). Specially Note: Don't change the modes directly  If you wanna change the device between transmitter mode and receiver mode, please turn off the device first, then change it to another mode. And restart it again. (The detail operate please refer to the user manual.)