MAXTOMARS M4 4-Channel Mixer with USB Input Mic-Line Professional Audio Mixing Console 3-Band EQs per channel USB Interface for U-disk / MP3 compatibility. Separate Stereo Tape Channel Low-Noise Discrete Mic Preamplifiers on all Microphone Input, XLR mic connectors on all mono channels 90-240V, US Plug. More Lightweight & More Convenient to take it anywhere For Home Audio, Self-made Music, Studio, Concert, Party, Bars, KTV, Meeting, Speech, etc. 1 Year Warranty. Any problem, please contact us by Amazon Message