JVC XS-SR4, 2.0 channels, 5 W, Silver, Neodymium, 1.57" (4 cm), 19.4 oz (550 g) JVC XS-SR4. Audio output channels: 2.0 channels, RMS rated power: 5 W. Product color: Silver, Magnet type: Neodymium, Driver unit: 1.57" (4 cm). Weight: 19.4 oz (550 g). Compatible products: Apple iPod, Dimensions (WxDxH): 15.4 x 5.35 x 4.06" (390 x 136 x 103 mm)