... plug into any USB portConvenientSturdy loop supports most key ringsHandyCompact sizeGuaranteed1-year warrantyOperating Temperature32°F to 140°F ... F (-20°C to 85°C)Operation systemWindows XP,Windows 2000, Windows Vista, Windows 7 or aboveAccessoriesManual ,cd drive, USB cable, lanyard, ... feel free to contact us,we will provide you professional technology support. If item was faulty, we will ...