Specification: Play time (hours): about 4 hours_x000D_Standby time (hours): about 10 hours_x000D_Appearance parameters:_x000D_Length: 8.5cm/3.34inch (Approx.)_x000D_Width: 2.5 cm/0.98inch (Approx.)_x000D_Height: 0.90 cm/0.35inch (Approx.)_x000D_Weight: 15.6 grams Features: 1_x000D_This is portable USB sport U disk MP3 music player. 2_x000D_Ultra-thin design, simple, exquisite and fashionable. 3_x000D_Support digital music playback in MP3, WMA music format. 4_x000D_Built-in rechargeable lithium battery, full of 10 beautiful music sound quality, perfect music enjoyment. 5_x000D_Stylish and compact appearance design, beautiful and exquisite workmanship, best gifts. 6_x000D_ PackageList: 1 * MP3 player