... 5. USB/SD card player Professional Portable 12" Speaker PA System With Dual Wireless Microphones & Rechargeable Battery ... -amplified portable wireless PA speaker system12'' woofer with 1.5” voice coil and 40oz magnet 45 watts RMS from ... Scope: *Room, outside(especially suitable dancing, gymnastics, demonstration's loud-speaker, recorded, play) *Teaching, Conference, classroom, military training, guide ...