Hello Kitty Speakers for iPod Dock for iPod 3G, 4G, 5G, Photo, Mini and Nano Hi efficiency digital amplifier, delivers great sound from any MP3 player/Audio Device Slim speaker box, Dimensions: 9.05 W x 4.92 H x 3.90 D Power: AC/DC Adapter (included) Alternative battery power requires 4 "AA" batteries (not included)