POWER SUPPLY:BATTERY(AAA 1.5V*4),DC 5V(USB CABLE FOR PC),OR AC POWER ADAPTOR CORD(OUTPUT 6V,300-800mA) SPEAKER UNIT:52mmx2W*2(4Ohms) OUTPUT POWER:2W*2(1KHz 10% THD) EREQUENCY RESPONSE:150Hz-18KHz DIMENSION:207(W)x53(D)x62(H)mm---(Open dim.)