This audio amplifier module supports MP3, cellphones, computers, TV AUX audio input, pure HIFI 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. 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 : 50W+50W mini version of the stereo BT digital amplifier board, support cellphone APP control+ BT connection + AUX input + U disk input+ USB sound card input. Support MP3, cellphones, computers, TV AUX audio input, pure HIFI 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. With 3.5mm audio input interface, support the connection of the audio system, you can plays music by connecting the audio. Multiple connection design, support connecting U disk and sound card. U disk lossless playback, plug in the U disk, open the APP switch "U disk" mode, and accompanied by a beep into the U disk playback mode. (Note : U disk interface is Type-C port ) With volumes adjustment function, support independent adjustment of left and right channel bass and high, support the adjustment of the main volumes. It adopts a rotary encoder knob which can achieve 360 degrees infinitely tunable, smooth and convenient operation. With various protective mechanisms : Power reverse connection protections, short circuit protections, self-recovery overheating protections. Specifications : Name : BT Audio Amplifier Module Material : printed circuit board BT version : 5.1 Audio channel : left and right channel (stereo ) Input mode : BT + AUX + U disk + USB sound card? Power supplies : DC12-24V Transmission distance : 15m unabgeschirmt Adapted horn : left and right channel 30-200W 4 Ohm 8 Ohm 16 Ohm APP control : support YS Audio-APP control Item size : 52 * 52 * 22mm / 2.05 * 2.05 * 0.87in Package size : 84 * 83 * 42mm / 3.31 * 3.27 * 1.65in Package weight : 75g / 2.65ounce Packing List : 1 * BT Audio Amplifier Module 1 * Screwdriver 1 * Adapter