Feature:1. [Multi Protection] BT 5.0 amplifier board has anti reverse, under voltage, over temperature, over current, short circuit protection mechanisms.2. [Built in Cooling Fan] Amplifier board built in ultra quiet fan, which can prevent the rotor from burning, no noise, and prolong the life.3. [Easy Adjustment] USB stereo power amplifier module allows you to adjust the frequency level, treble, bass.4. [High Power] The higher the power supply voltage, the greater the output power, the smaller the speaker impedance, the greater the output power.5. [Wide Compatibility] Power amplifier board can provide stable and fast connections and wide compatibility.Specification:Item Type: BT Power Amplifier BoardMaterial: PCBWorking Voltage: DC15-36VBT Version: 5.0Input Method: AUX, BT, USBNumber of Channels: 2.1 Channel (left channel + right channel + subwoofer)Output power: 160W+160W+220WAdapter Speakers: 30-200W, 4-8.Package List:1 x Amplifier Board1 x Adapter1 x Cover1 x Bottom Plate5 x Knob Cover1 x Screwdriver8 x Screw4 x Short Screw Column4 x Long Screw Column