Description: 2 in 1 Design: Transmitter (TX) and receiver (RX) 2 in 1 design, built in DSP decoding chip, heavy bass effect, supports 3 levels of adjustable gain, lossless stereo, low latency. Stable Connection: The AUX adapter uses V5.1 chip design, stronger compatibility and stability, 30 meters barrier free stable signal transmission. Support function, connecting when the mobile phone is close to it. Multi Interface: The wireless audio adapter supports U disk/TF card playback, support MP3/WMA/SBC/WAV/DTS/A52/FLAC/AAC/AIF/AMR/APE format. Built in 6.5mm microphone, supports microphone access for singing. Long Service Time: The audio receiver is built in 1200mAh rechargeable battery, continuous listening to music for about 8 hours, battery life of up to 30 days. Controllable indicator light, soft and not glaring, the brightness of the light increases/decreases accordingly with the volume. Wide Application: The transmitter receiver can easily support all kinds of audio equipment, suitable for mobile phones, tablet, active speakers, power amplifiers, desktop computers, mixers, TVs, etc. Specification: Product size: 9.8cmx6.7cmx2.42cm/3.86inchx2.64inchx0.95inch Material: PC Version: V5.1 Support protocol: A2DP/AVRCP/HFP/SBC Working frequency band: 2.402GHz-2.480GHz Power level: Class II Sensitivity: -85dBm