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 YS Audio-APP control supports both Android and iOS systems, APP visual operation playing mode, support volumes, sounds, up and down song controls, and playing pause, playing mode modification, BT name, set connection passwords. Features: Adopt high-capacity energy storage capacitor and 8 filtering appliances with long-lasting ultra-quiet cooling fan. Support MP3, cellphones, computers, TV AUX audio input, pure audiophile sound quality, treble pure and transparent, gentle and delicate midrange, bass surging shock. Cellphone YS Audio-APP control supports both Android and iOS systems, APP visual operation playing mode, support volumes, sounds, up and down song controls, and playing pause, playing mode modification, BT name, set connection passwords. 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 independent adjustment of left and right channel bass and high, independent adjustment of the heavy bass. It adopts a rotary encoder knob which can achieve 360 infinitely tunable, smooth and convenient operation. With various protective mechanisms: static, over-current, overheat 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 (left and right channel+subwoofer) Input mode: BT + AUX + U disk + USB sound card Power supplies: DC18-38V10A Voltage gains: 30dB Audio output: left and right channel 220W + subwoofer 350W Adapter horn: left and right channel 30-220W 3-8; subwoofer 30-350W 2-8 APP control: support YS Audio-APP control Item size: 141 * 131 * 27mm / 5.55 * 5.16 * 1.06in Item weight: 345g / 12.17ounce Package size: 160 * 140 * 55mm / 6.30 * 5.51 * 2.17in Package weight: 470g / 16.58ounce Packing List: 1 * BT Audio Amplifier Module 1 * Screwdriver