Actidata actiDisk RDX. Size: 63.5 mm (2.5 "). Interface: USB. Compatible operating systems: Microsoft Windows 2000, Windows XP Professional, Windows XP Home, Windows 2008 R2. Operating relative humidity range: 20 - 80 %, Operating temperature range (T-T): 10 - 40 °C, Storage temperature range (T-T): -40 - 65 °C. Power requirements: 100-240 VAC, 50-60 Hz