Potentiometer adjustment: master volume, stereo , stereo treble, subwoofer volume, subwoofer frequency master volume with buttons Single click: play/pause Double click: song Triple click: select or cancel mode Protection mechanism: over temperature, over current, short circuit, anti-static protection Features: Support Wuzhi Audio APP. Bluetooth name, password setting, prompt volume adjustment, on/off prompt sound, lullaby, firmware upgrade, etc. -to-box function and the true wireless function enable two sets of speakers to be combined into left and right channel box-to-box, with a stronger sense of spatial positioning. Model: -HT22 Name: 2.1 channel 160Wx2+220W Bluetooth audio power amplifier Power amplifier chip: TDA7498E Bluetooth version: 5.1 Bluetooth transmission distance: 10 (if you need a distance, please connect an external antenna yourself) Audio input: Bluetooth+AUX+U disk+USB sound card Audio output: left channel 160W + right channel 160W + subwoofer 220W Adaptive power supply: DC15-36V, 9A (not connected to AC) Adapted speakers: left and right channels 30-200W, 4-8Q; subwoofer 30-200W, 4-8Q Outer leads: 5 7P shielded wires 35cm Product size: 126 x 106 x 29mm Material: PCB colour: black Package Contents: 1 amplifier board 5 x shielded wire 5 x Potentiometer Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.