... 5. USB/SD card player Professional Portable 12" Speaker PA System With Dual Wireless Microphones & Rechargeable Battery 180 ... speaker System Specification: Professional bi-amplified portable wireless PA speaker system12'' woofer with 1.5” voice coil and ... s loud-speaker, recorded, play) *Teaching, Conference, classroom, military training, guide, sales promotion, public sale's loudspeaker recorder ...