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, power-saving design, more than 90% power efficiency. Maximum support 100W (Bass) bass channel output o input sensitivity: 500 mV; Speaker impedance: bass speaker impedance: 2-8 ohm Compatible with switching power supply adapters, laptop power supplies, rectified filter transformer power supplies, rechargeable batteries, or vehicle power sources Size: 83 x 55 x 29mm Material: Plastic Color: Blue Package Contents: 1 x o 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 be slightly different from the real thing. Measurement allowed error is +/- 1-3cm