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 for bass frequency processing, with bass volume potentiometer control DC 12-24V power supply, wide operating voltage range, power-saving design, over 90% power efficiency. Maximum support 100W (Bass) output Audio input sensitivity: 500 mV; Speaker impedance: 2-8 ohm Compatible with switching power supply adapters, laptop power supplies, rectified filter transformers, rechargeable batteries, or vehicle power sources Size: 83 x 55 x 29mm Material: plastic Color: 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 to vary slightly from the real thing. Measurement allowed error is +/- 1-3cm