Sharp DK-AP7N-S, 2.1 channels, 4.4 W, 47000 Ω, Silver, 3 cm, Alkaline Sharp DK-AP7N-S. Audio output channels: 2.1 channels, RMS rated power: 4.4 W, Impedance: 47000 Ω. Product colour: Silver, Driver unit: 3 cm. Battery technology: Alkaline, Battery type: AA, Battery voltage: 1.5 V. Weight: 576 g. Compatible products: iPod, MP3, Dimensions (WxDxH): 198 x 69.8 x 77 mm, I/O ports: 1 x Aux-in jack