mini PA amplifier 1.lithium battery/LCD display screen 2.USB/SD Jack 3.UHF 16 channels wireless microphone 4.CE& ... bright sound and many special designs make it outstanding in amplifier products. Besides, with the intelligent charging system (Built in ... control,MP3 control,microphone control,echoes control16 channel frequency UHF wireless microphone with volume control.Using shattered proof synthetic ...