Music format: mp3 wav wma Usb interface: usb2.0 Mfr playing life: Approx 6 hours Li-battery capacity: 400mah Max. Input power supply:5vdc Earphone output power:5mw Voice output frequency:20hz-20khz Thd:0.05% Signal-to-noise rstio:85db Earphone impedance:16ª+ Working current: 5v dc/500 mah Camera:1.3 mega pixel Read rate:ú+700kbs, Writing rate:ú+500 kbs Dv:640ú¬480 Dc:1280ú¬960 Unit net weight(with battery):39g Working temperature:0ípc-60ípc Storing time:-20ípc-80ípc Microsoft windows pc :win98 win me winxp win2000 windows vista Units:usb cable, charger, disc, glass-fabric, manual