... flash drive and extendable upto 4GB- Supported Formats: MP3, WMA,WAV, AMV, ASF, JPG, TXT.- PC Connection High Speed USB 2 ... , ME, 2K, XP, MAC OS10, LINUX 2.4.2- External Speaker- Built-in rechargable Li-ion battery (4 hours max. playtime ... item pictures you may interested in: 2.0 inch Orion Mp4 player