Item no.: CP1220 Specification: Output Power: 3watts iPod docking built in 3D function Power on/off, digital volume control Class-D amplifier Aux input jack with 3.5mm stereo cable 2pcs of 2" magnetically shielded full range driver 5V AC/DC switching adaptor included Four AA batteries support Perfect for all sizes of iPods, laptop and other personal audio devices Dimensions (W x D x H) mm: 220x58.2x87