[ ] 2GB Mini MP3 W Stereo Sound - Sound Speaker FM Radio Function Manufacture Specifications: Speaker Function Music format: mp3, wma Storage: 2G Support FM radio: 87 ~ 108 MHz Built-in Hi-Fi high quality and high efficiency speaker monomer Support MP3 WMA format, txt book Charge time: - USB charge: 7 hours (5V 1A) - AC transformer charge: 4 hours Dimensions (L x Diameter): 88 x 35 x 35 mm USB port: 2.