Pioneer XW-NAS3. Audio output channels: 2.1, RMS rated power: 30 W, Frequency response: 50 - 20000 Hz. Battery technology: Lithium-Ion (Li-Ion), Input voltage: 220 - 240 V, Input frequency: 50/60 Hz. Dimensions (WxDxH): 420 x 210 x 148 mm, Weight: 5 kg. Colour of product: White. Compatible products: iPod