Small Size Stereo Speakers Powered From A Computer USB Port Or Any 5V DC Voltage Source. . Speaker Output Power: 6W - 3W * 2 Power Source: USB DC 5V Transmission Frequency: 90HZ- 20KHZ Signal To Noise Ratio:> = 60 Db Input Resistance: 4 Ohm Dimensions Of A Single Speaker: 62 X 62 X 54mm