The mixer audio is a multi-purpose 8-channel mixer that can be meet users of home music recording, webcast, Singing, small party, and other needs. Features: With stable quality, portable, artistic, small and exquisite. Suitable for company, stage, home, KTV rooms, etc. Connect the front of amplifier to input and power control the host. Dual Microphone inputs, video input and sound output for video signal, volume can be adjusted individually. Reverberation delay function and audio inputs/outputs for left/right channel volume frequency regulation. With anti-slip rubber pad for safe use. It can be powered by USB or battery (battery not included). Specifications: Color: black Material: plastics+metal Effect: 12ms-200ms Output voltage: 4V Max Signal to noise ratio: more than 85d - B Distoration: 0.03percent (1KHz Full Power) Frequency response: 20Hz-20KHz+/-3d - B Input sensitivity: MIC: -36d - B Line: -10d - B Eff Ret:-12d - B Tape In: -26d - B Item size: 173 * 130 * 40mm / 6.8 * 5.1 * 1.6in Item weight: 650g / 1.4lb Package size: 210 * 135 * 55mm / 8.3 * 5.3 * 2.2in Package weight: 755g / 1.7lb Packing List: 1 * Sound Mixer 1 * USB Cable 1 * User Manual