Thin name card design with large logo space. Easy to put inside wallet/pocket/bag/file holder/book, etc Attractive easy button to play mp3/wma music. Bulit-in lithium rechargeable battery with long time performance (6 hours) Usb cable for charging and data transfering. Charging time: < 3 hours. Support usb2.0, operation system: windows98/se/2k/xp, mac os 10, linux 2.4.2 Interface: usb2.0 (read: 1000k byte, write: 800k byte) Flash memory inside. Current memory capacity: 1gb. Color: white/black/blue/green/red/gold ect.. Oem: the custom logo, and picture can be designed according to customer's special favor Accessory: 1 x earphone; 1 x usb cable; 1 x user manual. Size: 85mm(l)54mm(w)4mm(h) Weight: 20g