Used Nissindo KP-100 Karaoke Mixer. Input impedance AUX/CDV/Tape/Mic: 210mV/23 kiloohms (1000mV). Audio stereo input: RCA. Microphone input: 3 1/4 Front. Audio output level/Impedance: (1000mV). Audio stereo out: RCA. Digital echo delay time: 120MS. Dimensions (WxHxD): 420 x 60 x 320 (mm).