Feature:  1. The sound quality is pure and transparent.  2. Cool volume level indication.  3. 8-level brightness selection.  4. 360-degree stepless tuning.  5. With cool APP.     Specification:  Name: 2.0 channel 80WX2 stereo Bluetooth audio power amplifier.  Bluetooth version: 5.1.  Audio input: Bluetooth+AUX+U disk+USB sound card.  Audio output: left channel 80W + right channel 80W.  Adapter power supply: 9-24V, 4A (can not be connected to AC).  Adapter speaker: 20-100W, 4-8ohm.  Volume adjustment: multi-function knob, 360-degree stepless tuning, with volume level indication.  Click: Play/Pause.  Double click: mode switch (Bluetooth/U disk/AUX).  Press and hold for 1 second: turn on/off.  Rotate: adjust the volume.  Protection mechanism: over temperature, over current, short circuit, anti-static protection.  Features: Support Wuzhi Audio APP. Modify the Bluetooth name, password settings, prompts.  Sound volume adjustment, on/off prompt sound, sleep aid, sound effect selection + custom sound effect, U disk playlist, volume indicator brightness adjustment.  Product size: 60 x 60 x 32mm.  Product weight: net weight 53g, including packaging 88g.     Package includes:  1 x amplifier board