Bluetooth Transmitter Receiver, ALLIMITY 2 In 1 Wireless Transmitter for Speaker Headphones Tablet TV, Wireless Receiver for Android and all Smartphones/Home Audio System(Upgraded Version) 1. 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. 2. Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, MP4, CD / DVD players, e-readers, TVs, Computers, PC and more). 3. Built in battery for portable use; Battery life for TX mode: about 8 hours; battery life for RX mode: about 6 hours. Charging time:1-2 hours. 4. Bluetooth V3.0, Support profile: A2DP and AVRCP, stereo stream output, transmission distance range to 10 meters( about 33 feet). 5. Important: NOT 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. Package contents: allimity Bluetooth Transmitter/ Receiver, 3.5mm Audio Cable, USB Charging Cable, 3.5mm Red and White AV Cable, User Manual. if you are not sure how to use this device, please feel free to contact us, we will try our best to help you.