Power rating: -40W (20W + 10W x 2). Ratio of Signal to Noise: -68 dB or greater Degrees of Separation: at least -50 dB Regularity Reaction: -60 Hz to 18 kHz 6.5" low speaker as the speaker unit 3" high speaker with 4 ohn and 8 ohn Functions include USB, SD, LINE, and BT. Dimensions: W x H wide x D deep Main dimensions: 255 x 255 x 255 mm Voltage: 50Hz AC 220V Computers, cell phones, MP3 players, and other multimedia audio source devices are compatible.