... USB,SD connector,12V battery 2.Wireless mic 3.Speaker: 10"woofer,horn tweeter 4.RMS power: 100W Portable SystemBuilt-in with MP3 player ,USB,SD ... .3. All new design of switching power circuit can transfer 12V DC electric current up ot 110V or 220V & create huge ... to 30 wireless transmission distance).6. Built-in with MP3 player ,USB,SD connector,can be inserted flash memory card,MP3,MP47.Built ...