This audio amplifier module supports MP3, cellphones, computers, TV AUX audio input, pure audiophile sound quality, treble pure and transparent, gentle and delicate midrange, and bass surging shock. Support BT connection, support connect to the audio system, U disk, and sound card. With volumes adjustment function, support the left and right channel volumes adjustment, master volumes adjustment, and subwoofer volumes adjustment. Cellphone APP control supports both Android and iOS systems, APP visual operation, playing mode, volumes, sound, up and down song control, and playing pause. Features: Support MP3, cellphones, computers, TV AUX audio input, pure audiophile sound quality, treble pure and transparent, gentle and delicate midrange, bass surging shock. Cellphone APP control supports both Android and iOS systems, APP visual operation, playing mode, volumes, sound, up and down song control, and playing pause. BT connection, support for cell phones, tablets, laptops input, etc. Support the connection of the audio system, you can plays songs by connecting the audio. Multiple connection design, support connecting U disk and sound card. With volumes adjustment function, support left and right channel volumes adjustment, master volumes adjustment, and subwoofer volumes adjustment. It adopts a rotary encoder knob which can achieve 360 stepless tuning, smooth and convenient operation. With various protective mechanisms: overvoltage, under-voltage, overheating, direct current detection, and short circuit protections. Specifications: Name: 2.1 Channel BT Audio Amplifier Module Material: printed circuit board BT version: 5.1 Audio channel: 2.1 channel Input mode: BT + AUX + U disk + USB sound card Power supplies: DC9-24V/5A or more Audio output: left and right channel + subwoofer Frequency ranges: 20Hz-30KHz Volumes adjustment: high-end encoder knob adjustment, smooth feel Output power: 50W*2 (left and right channel) + 100W (subwoofer) Satellite box (left and right channel) with speakers: 10W-100W /4-8 Subwoofer (subwoofer) matching speakers: 20W-200W /2-8 Special Features: support APP control Item size: 82 * 84 * 24mm / 3.23 * 3.31 * 0.94in Item weight: 116g / 4.09ounce Package size: 123 * 85 * 41mm / 4.84 * 3.35 * 1.61in Package weight: 161g / 5.68ounce Packing List: 1 * BT Audio Amplifier Module 1 * Screwdriver