... Microphone SetItem Specifications:shier AK12-200 Portable PA Speaker with Casters USB SD MP3Mobile and active PA ... (30cm) bass driver and 100W amplifier power45W RMS speaker load (equivalent to 160W max.)Supplied with VHF Wireless ... Scope: *Room, outside(especially suitable dancing, gymnastics, demonstration's loud-speaker, recorded, play) *Teaching, Conference, classroom, military training, guide ...