Maximum power per channel:80W  Model:2.1  Bluetooth power amplifier channel:3 (2.1)  The board uses two pairs of imported disassemble to the tube A1633 C4278 amplification tube, and the capacitor uses the ELNA4700UF35V disassembling capacitor, withstand voltage and capacity. The amplifier has good performance, good sound quality, clear treble and powerful bass. The board is also designed with aMicro-phone input that can be used as a megaphone to add a fan to ensure effective heat dissipation at full power.  Working voltage:double AC18-26V(recommend 80-100W Toroidal transformer)  Rated power:80W+80W+80W  Frequency response:20Hz-30KHz  Impedance:4-8Ohm  Distortion:1%  With Bluetooth wireless / digital display / U disk / TF card FM radio / remote control.  colour:green  Material:PCB  Size:14.5 * 13.5 * 6cm  Package Contents:  1* power amplifier board  1* remote control  Only the above package content, other products are not included.  Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.