DESC: Product Features: Interface: USB; Storage Capacity: 1 GB; Main Storage Type: Built-in Memory; Number of Songs: 250; Usage: Music; Audio Format: AAC, AIFF, Audible, MP3, WAV; Battery Life: Up to 12 Hours; Battery Type: Li-ion Battery; Depth: 0.34 in.; Height: 1.14 in.; Width: 1.24 in.; Weight: 0.55 oz.; Weight and Size: Ultralight; Family Line: iPod Shuffle