DESC: Product Features: Interface: USB 2.0; Storage Capacity: 4 GB; Screen Size: 2 inch; Main Storage Type: Built-in Memory; Number of Songs: 1000; Usage: Music, Photo Viewing, Video; Audio Format: AAC, MP3, WMA (DRM); Video Format: WMV; Max Video Resolution: 800 x 600; On Screen Display: Battery Level, FM Frequency, Mono / Stereo, Play Mode, Playlist / Table of Contents, Recharging, USB Connection; Outputs: Headphone Jack; Additional Features: FM Stereo Tuner, Sleep Timer, World Clock; Battery Life: Up to 50 Hours; Battery Type: Rechargeable Li-ion Battery; Power Source: Internal Battery, Rechargeable via USB cable; Depth: 1.75 in.; Width: 3.5 in.; Weight: 1.9 oz.; Weight and Size: Compact; Family Line: Sony WALKMAN