... (2 Wireless Digit Microphone with 18 control buttons and 2 wired Digit Microphone with 16 control buttons) Compatible: DAT, AVI, VOB, ... front panel. Features: vocal on-off , echo, key control, tempo, Melody volume control, favorite songs reserve, random play, repeat, continuous play; ... pcs SD card slots. New!!! Internal 2.5inch Hard Drive Device slots. New!!! 2 Wireless Mic receiver slots New!!! 2 ...