Features: 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 transferring. 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 does not include. Can Support Memory Capacity: 1GB/2GB. Color: Available color at present: Silver/Black/Pink/Blue/Orange OEM: The Custom Logo can be designed according to customer's special favor. Size: 41.3mm, L : 28.2mm, W : 12.4mm Net Weight: 15g Accessory: 1 x Earphone; 1 x USB cable; 1 x packing box.