Lumsing 3.5mm A2DP Wireless Bluetooth Home Audio Stereo Receiver Transmitter Adapter for Headphones, TV, Computer, PC, iPod, MP3, MP4, Car Stereo Bluetooth Transmitter Function: Transmitter(TX) Mode-- Plug In To Your Non-Bluetooth Device And Pair Up Your Bluetooth Speaker Or Headset. Bluetooth Receiver Function:Receiver(RX) Mode -- Plug Into Your Non-Bluetooth Speaker And Pair Up Your Bluetooth Phone Or MP3 Player. Easily switch between transmitter(TX) and receiver(RX) mode. Battery life for TX mode: about 11 hours; battery life for RX mode: about 6 hours.Can work while charging. Micro charging port. Supported Bluetooth profiles: A2DP/ apt-X; operation range: 33 ft / 10m.Can be paired to any bluetooth enabled devices, such as mobile phone, laptops, speaker and Bluetooth audio transmitter.