Feature: --Support folder: built-in rechargeable lithium-ion battery, can be used for up to 25-30 hours when fully charged. --Compatible system: Compatible for Windows 98 / SE / ME / 2K / XP / VISTA / 7 Mac OS 10, Linux 2.4.2. --Preset EQs: Normal, Rock, Pop, Classic, Soft, Jazz, DBB. --Compatible for JPEG/BMP/JIF photos, only support eBook mode .txt files. --Dimensions: 90x40x8mm. Description: Product Name: MP3 Player Music playing time: 30 hours Use free conversion software: supports mp3 format as well as wma, wmv, for asf, wav, mtv and amv Interface: USB 2.0 Recording: built-in recorder Display: 128x96 pixels Screen size: 1.8-inch TFT color screen Dimensions: 90x40x8mm Radio: built-in FM radio Packing list: 1 x MP3 player Note: 1. Due to manual measurement, please allow 1-3cm error. Make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks.