The amplifier can be used to car audio system/subwoofer speaker. High efficiency and wide frequency, give you a perfect in-car entertainment. High efficiency, wide frequency, voltage. Strong heat dissipation power drawing technology is compact. 12V 1000W car audio amplifier board gives you a wonderful in-car entertainment. With current protection, overload protection, short circuit protection. Voltage: 12V Maximum power: 1000W Impedance: 4Ω : Less than 0.1% Frequency Response: 20Hz~250KHz Signal to noise ratio: 89db Type: amplifier board color:Black Material:Aluminum alloy + electronic components size:21.3 x 17cm Package Contents: 1 x subwoofer amplifier board Only the above package content, other products are not included. Note: Light reflection 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.