To all dear customers: If you have any problems with the product, please dont complain first. You can contact us through the information in the order details, and we will solve the problem as soon as possible. If the product has a quality problem during the 30 -day insurance period, you can tell us in the after -sales chat room.You can take pictures or videos in advance, so that we can provide you with more convenient tracking services according to the damage of the product. If you need to return and exchange/return refund service, please send it back to the warranty period according to the original packaging period for 30 days.Important Tips: When connecting the power cord installed by the battery to the car audio, it is necessary to install insurance in advance to prevent short circuit affecting car audio and batteries.1. Pure amplifier with pure sound quality. Aluminum shell. Eliminate various electromagnetic interference. When nothing passs by. No click. There is no noise or silence that can be heard.2. Wide compatibility. RCA and 3.5mm audio input. Support various audio inputs. Such as mobile phones, DVD players, computers, MP3 and MP4 player, etc., which is very suitable for use in your vehicle or home, intelligent lightweight aluminum shell,3. Compact but powerful, compact and simple, practical and powerful mini design, high -power audio large chips, low distortion,4. Simple wiring, very suitable for your vehicle or family, intelligent and lightweight aluminum shell. Two pairs of speakers output clamps are convenient to wiring, which can completely control volume, treble and bass.Specification:Type: Class A/BMaterial: aluminum alloyColour: BlackChannel: 4Voltage: DC 12VSNR: 200MV-8VSensitivity:> 90dbPeak output: 6800WSignal -to -noise ratio (SNR):> 90dBTotal harmonic distortion: <0.15 %Frequency response: 10Hz-30KHzSize: 34*21*4.5cm / 13.4x8.3x1.8inPackage Included:1 x 6800W 4 channel car amplifier4 x screw accessories1 X fed1 X instruction