100W Subwoofer Amplifier Board;Frequency response range: input: 20 hz - 20 KHZ, output: 20 hz - 180 hz Operating voltage range: DC 12-24V(maximum voltage is no more than 24V); built-in TPA3116 amplifier chip;This is a pre-amplifier, frequency processing, with volume potentiometer control of the amplifier board. DC 12-24V supply, wide operating voltage, -saving design, more than 90% efficiency. Maximum support 100W () channel output Audio input sensitivity: 500 mv;Speaker impedance: speaker impedance: 2-8 ohm You can use a good switching supply adapter, laptop switching supply, or rectified filter former supply, you can also use rechargeable batteries, or vehicle supply and so on. size:83 x 55 x 29mm Material:plastic colour:blue Package Contents: 1 x Audio Amplifier Board Only the above package content, other products are not included. Note: Light 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.