Potentiometer adjustment: master volume, stereo , stereo treble, subwoofer volume, subwoofer frequency master volume with buttonsSingle click: play/pause Double click: song Triple click: select or cancel modeProtection mechanism: over temperature, over current, short circuit, anti-static protectionFeatures: Support Wuzhi Audio APP. Modify 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.: -HT22Name: 2.1 channel 160Wx2+220W Bluetooth audio amplifier amplifier chip: TDA7498EBluetooth version: 5.1Bluetooth transmission distance: 10 (if you need a distance, please an external antenna yourself)Audio input: Bluetooth+AUX+U disk+USB sound cardAudio output: left channel 160W + right channel 160W + subwoofer 220WAdaptive supply: DC15-36V, 9A (not connected to AC)Adapted speakers: left and right channels 30-200W, 4-8Q; subwoofer 30-200W, 4-8QOuter leads: 5 7P shielded wires 35cmProduct size: 126 x 106 x 29mmMaterial: PCBcolour: blackPackage Contents:1 x amplifier board5 x shielded wire5 x PotentiometerOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.