F mp3 songs to portable usb and sd mass storage devices such as mp3 players and usb flash drives Mobile trolley design - wheels, retractable tow handle and side handle horizontal Weatherproof, rugged abs housing Suitable for stand mounting Stackable series Connections: 1 x usb, 1 x sd input, 2 x 6.3 mm jack, microphone input, 1 x rca stereo line input, 1 x 12v terminal connection Playable formats: mp3, wma Frequency wireless microphones: 174-270mhz Mp3-control section, with a backlit lcd display and repeat function 2-band equalizer - bass and treble adjustable Adjustable echo effect Mic section with removable telescopic antennas, separately adjustable microphone volume, master volume and microphone operation leds Adjustable master volume On and off switch on the microphone Microphone priority function Sensitivity: 97db Frequency response: 40hz to 20khz Mute Microphone power supply: 9v battery Power box: 230v, 50hz 34 x 58 x 31cm (w x h x d) Weight: 13.6 g Standard packing