Item no.:PS30 Specification: 1.5-inch*4 drivers RMS: 1.4 W + 1.4W Power and volume controls Features MaxxBass technology Included, UL/CUL or CE/GS listed Convenient 4 pcs AA battery compartment included Power supply: 5V 1,000mA, convenient switch adapter from 100V to 240V Dimensions (W x D x H) mm: 195 x 36.5 x 33.5