Sharp DK-AP7N-S, 2.1 channels, 4.4 W, 47000 Ω, Silver, 1.18" (3 cm), Alkaline Sharp DK-AP7N-S. Audio output channels: 2.1 channels, RMS rated power: 4.4 W, Impedance: 47000 Ω. Product color: Silver, Driver unit: 1.18" (3 cm). Battery technology: Alkaline, Battery type: AA, Battery voltage: 1.5 V. Weight: 20.3 oz (576 g). Compatible products: iPod, Dimensions (WxDxH): 7.8 x 2.75 x 3.03" (198 x 69.8 x 77 mm), I/O ports: 1 x Aux-in jack