Features: --4-Channel 8900 Watt Car Power Amplifier. --Amplifier Class: Class A/B. --Stereo surround. --Main push four-door speaker. --Passive subwoofer. --Slim design. --Aluminium alloy casting drawing process. --External heat sink. --Thermal Overload; Speaker's Short Protection. --Shell with a standaro safety interface put and end to bad parts. --Aluminum alloy heatdisspation design hole design wider air-contact surface heat faster. Specifications: Material: Aluminium alloy. Channel: 4. Working Voltage:DC 12V. Peak Power Output: 8900 W. Peak Power Output: 2 Ohms 2200Wx 4 Channels. Peak Bridged Power Output: 4Ω 4400W x 2 Channels. RMS Power Output: 4Ω 120W x 4 Channels. Total Harmonic Distortion (THD)  RMS Output: ＜0.01%. Signal-to-Noise Ratio (SNR): ＞95dB. Sensitivity: 150mV. Impedance: 2Ω~4Ω. Frequency: 20Hz~40KHz. Notes: 1. Due to manual measurement, please allow a difference of 0.5-1cm. 2. Due to the difference of light and screen, the color of the product may be slightly different from the picture. Package Included: 1 x Car Audio Amplifier; 1 x User Manual