Measurement:23X16X14MM Net Weight: 21G(with lithium battery) Display: Dual color LCD Power supply: built-in lithium battery. Playback time: 6 hours Memory:128MB, 256MB, 512MB, 1G, 2G, 4G choice Music Files:MP3/WMA Recording Format:WAV, ACT Picture browsing: EXIF2.1,Picture format: JPEG Standard USB 2.0 interface Colors: Black, White, Silver, blue, Pink, Yellow Others: lyric reading, multi timbre mode, etc. one of smallest and most reliable MP3 player in the market Trademark: EINTRASSE Standard: CE, FCC