Coby Compact Folding Portable Stereo Speaker System for iPod and MP3 Players (White) (Discontinued by Manufacturer) Compatibility: all iPods and MP3 players Compact folding design for ultra portability High-efficiency amplified speaker system for optimal playback 3.5 millimeter input jack for all types of portable audio use Operates on 4 AA batteries (not Included) or AC adapter (included) for power versatility