100W Subwoofer Amplifier Board;Frequency response range: input: 20 hz - 20 KHZ, output: 20 hz - 180 hzOperating voltage range: DC 12-24V(maximum voltage is no more than 24V); -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 outputAudio input sensitivity: 500 mv;Speaker impedance: speaker impedance: 2-8 ohmYou can a good switching supply adapter, laptop switching supply, or rectified filter transformer supply, you can also rechargeable batteries, or vehicle supply and so on.size:83 x 55 x 29mmMaterial:plasticcolour:bluePackage Contents:1 x Audio Amplifier BoardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.