<p>Potentiometer adjustment: total volume, stereo bass, stereo treble, subwoofer volume, subwoofer frequency, total volume with buttons: click: play\/pause; Double click: next song; Three clicks: select or cancel the box matching mode</p> <p>Protection mechanism: over temperature, over current, short circuit, anti-static protection</p> <p>Featured function: support Wuzhi Audio APP. Modify Bluetooth name, password settings, prompt tone volume adjustment, on\/off prompt tone, lullaby, firmware upgrade, etc. The box to box function and the true wireless function enable the two sets of speakers to be combined into a left and right channel box to box, with a stronger sense of spatial positioning.</p> <p>Product name: 2.1 channel 160Wx2+220W potentiometer external Bluetooth audio amplifier</p> <p>Model: ZK-HT22</p> <p>Power amplifier chip: TDA7498E</p> <p>Bluetooth version: 5.1</p> <p>Bluetooth transmission distance: 10 meters (if you need a longer distance, please connect an external antenna)</p> <p>Audio input: Bluetooth+AUX+U disk+USB sound card</p> <p>Audio output: left channel 160W+right channel 160W+subwoofer 220W</p> <p>Adaptive power supply: DC15-36V, 9A (AC power is not allowed)</p> <p>Adaptive speaker: 30-200W, 4-8 for left and right channels; Subwoofer 30-200W, 4-8 </p> <p>External lead: 5 7P shielded wires 35cm</p> <p>Product size: 126 x 106 x 29mm</p> <p>Material: PCB+Metal</p> <p>colour: Black</p> <p>Package Contents:</p> <p>1 x ZK-HT22 lead in Bluetooth amplifier module</p> <p>5 x 7P shielded wire</p> <p>5 x Potentiometer</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>