KA-550R Professional 600W Karaoke Mixing Amplifier Plus USB Recording Function 300W+300W; 120V/230V; Professional Digital Echo with Separate Stereo/Mono Hi / Low / Repeat and Delay control;Music with Master/ Depth/ Balance/ Hi/ Mid/ Low Controls USB Recording Funtion *Sing and Record Your Voice at the Same Time*. 4 Mic (2 Front / 2 Back) Inputs with 1 & 2 Mic Individual Volume / Balance / Hi / Mid /Low Echo On/Off Switches 2 sets of Audio /Video Inputs / 1 Video Output Jacks;Sub-woofer / Line / Rec. Outputs Digital Key Control;Manual / Auto Volume Reset;Full Function Remote Control; Cooling Fan Designed in Japan, 1 year parts manufacturer warranty