... *2 3.Speaker unit:4"+3"*2 4.Electroplating Knob 5.Support usb ,sd card ,vfd display Specification:Output power: RMS ... :8W)Rated impedance: 4Ohms-8OhmsSNR: > 89 dB Speaker units: 4″bass+2*3″full rangeFrequency response: 40Hz-18 KHzDescription:1. Built ... remote control4. With Karaoke function,2 microphone socket input5. Volume, bass, treble, echo, mic-volume separately control6. Compatible with PC/VCD ...