Martin Ranger KM300 Digital Karaoke Mixer with 1 Wired Microphone Two 1/4" Microphone Inputs - Connect 2 Microphone either at the front or back panel Two XLR Balanced Inputs - Connect two XLR microphones, electric guitar, Piano Keyboard, or sound sources located at the rear panel. Two individual microphone volume control located at front panel to set the volume of each microphone for individual volume comparison Vocal cancellation function (Depend on music disc used whether it support the function)