This BT5.0 intelligent audio stereo subwoofer amplifier board can be widely used in your audio system. BT function allows you to connect this tool with your mobilephone, you can achieve the volumes adjustment, song switch, playing and pause on your mobilephone. Come and have a try, it will not let you down. Features: Support left and right channels be adjusted independently for high and bass, and the heavy bass can be adjusted independently. Support mobilephone APP control, you can achieve the volumes adjustment, song switch, playing and pause on your mobilephone. This tool support BT, U disk, USB sound card and AUX input, you can use the suitable way to use. Multiple protection: This tool has electrostatic and overcurrent protection, short circuit and overheating protection, which can prolong the service time. The power supplys ranges of this product is 5-26V direct current, compatible with standard 5.5-2.1/2.5 power adapters, it is recommended to use a 12V/24V standard power adapter with a current output of more than 10A. Specifications: Material: Metal Power supplys: direct current 5-26V/10A or above BT version: 5.0 Audio Channel: 2.1 channel Audio Input: BT+AUX+U Disk+USB Sound Card Audio Output: Left and Right Channels+Subwoofer+3.5mm Stereo Port Frequency Range: 20HZ~30KHZ Output Power: 50W+50W+100W SNR: 92dB Left and right channel adapter speaker: 10W-100W /42-8 Heavy bass adapter: 20W-200W /4 -8 APP: YS Audio Package size: 135 * 110 * 45mm / 5.3 * 4.3 * 1.8in Package weight: 156g / 5.5ounce Packing list: 1 * Upper Cover 1 * Lower Cover 1 * Printed Circuit Board 8 * M2x4 mm Screws 4 * M2x18 Copper Pillars 4 * M2x5+4 Copper Pillars 5 * Knob Caps 1 * Screw Driver