Feature:   1. Upgrade the NFC function, and the mobile phone sensor can be connected with one touch. 2. Controllable indicator light, soft and not glaring, the brightness of the light increases/decreases accordingly with the volume. 3. Built-in 1200mAh rechargeable lithium battery, continuous listening to music for about 8 hours, battery life up to 30 days 4. Support U disk/TFcard playback and launch, support MP3/WMA/SBC/WAV/A52/FLAC/AAC/AIF/AMR/APE format. 5. Support 5~8 meters red private model external remote control, mode/signal/volume/up and down song/mixing/microphone and other operations. 6. Built-in 6.5mm high-definition microphone, which supports microphone access for singing, and built-in anti-howling design. 7. The product connection is simple, without any cumbersome drive and APP download.      Description: Product Name: Audio Adapter Product model: M16 Pro Bluetooth-compatible version: Bluetooth-compatible V5.1 Support protocol: A2DP/AVRCP/HFP/SBC Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBm<0.1%BER Signal-to-noise ratio: ≥90dB Distortion: ≤0.1% Interface Type    : Input: 3.5mm AUX+RCA+USB+TFcard+6.5mm microphone+digital optical fiber+digital coaxial Output: 3.5mm AUX+RCA Supported formats: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC/AMR/MIDI/G726/MTY Built-in battery: 3.7V/1200mAh Charging current: about 1000mA (MAX) Charging time: about 1.5 hours Battery life: RX about 8H, TX about 8H Bluetooth-compatible distance: ≤30M (open place) Charging method: Type-C 5V/1A Compatible equipment: mobile phones and tablet computers, active speakers, power amplifiers, desktop computers, mixers, TVs, karaoke machines, etc. Product size: 98 x 67 x 24.2mm (length x width x height) Product weight: about 120g      Packing list: Adapter host x 1 3.5mm audio cable x 1 RCA lotus thread x 1 Type-C charging cable x 1 Instruction x 1