FUNCTION: ?128MB Built in FLASH memory (optional 256 / 512/1GB ) ?High Quality MP3 and WMA playback ?Included USB Cable Connector easily Docks to any USB jack 旴lue and red LED indicate the status ?very easy to operate ?Operate in 3A battery ?Plastic cabinet with PU coating 昒p to 10 hr MP3 play time ?Upgradeable firmware included Windows 98 Driver ?operation system:windows 98(driver required)windows Me/XP/2000(no driver required) ?Signal to Noise Ratio:>90dB ?Output:11mW+11mW,32ohm ?USB 2.0 full speed