Features: 1.Supports MP3/WMA audio format and U-disk function 2.Windows compatible file system as removable drives (FAT 12/16/32) 3.Windows98/ME/2000/XP (No driver procedures are needed above Windows98) 4.No display 5.Rechargeable battery 6.USB2.0 High speed interface 7.MLC type NAND falsh available 8.Necklace case,touch pad Specifications 1.Size: 42*14*7mm 2.Weight: about 18g (player body with battery) 3.Power: rechargeable battery 4.Data transferring interface: USB2.0 High speed interface 5.Storage media: on-board flash memory (128MB/256MB/512MB/1GB/2GB/4GB) 6.Bit rates: MP3 format 8-320Kbps,WMA format 32-384Kbps 7.S/N ratio: 90dB 8.Earphone O/P: 50mW 9.Frequency response: 20Hz-20KHz System requirements: 1.Windows98/SE/ME/2000/XP or later 2.PC with USB port