Description: 2 in 1 Design: Transmitter (TX) and receiver (RX) 2 in 1 design, built in DSP decoding chip, heavy ba effect, supports 3 levels of adjustable gain, lole stereo, low latency.Stable Connection: The AUX adapter uses V5.1 chip design, stronger compatibility and stability, 30 meters barrier free stable signal transmiion. Support function, connecting when the mobile phone is close to it.Multi Interface: The wirele 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 acce 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 brightne 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/3.86inchx2.64inchx0.95inchMaterial: PCVersion: V5.1Support protocol: A2DP/AVRCP/HFP/SBCWorking frequency band: 2.402GHz-2.480GHzPower level: Cla IISensitivity: -85dBm Package Includes: 1 Transmitter Receiver1 3.5mm Audio Cable1 RCA Cable1 Type C Charging Cable1 Manual