4 channel mixer series skytec stm number of channels 4 dimensions 20 x 55 x 24 cm weight 1 kg number of mono channels 4 number of stereo channels 4 effects 8 digital effects equalization 5 band eq function cue function features usb mp3 playbackrecord interfaces bluetooth usb sd card slot connections usb sd card microphone inputs 1 phono input 1 line in 2 inputs 2x lr line rca 1x lr phono rca 1x mic jack 635mm outputs 635mm headp