PA speaker system 1.speaker power:30-50W 2.grinds sand material MDF ... speaker system(X-210) Features:1.high frequency2.fantastic sound quality3.MP3,CD,PC input4.grinds sand material MDF5.teachers use,classroom speaker ... and ISO 9001:2000 certified.8.Application:school,classroom,multimedia room, multifunction room and classroom sport square, big concert, multifunction hall and ...