iTEC MYSAFEUSB3. Size: 63.5 mm (2.5 "), Hard drive interface: Serial ATA. Interface: USB. Compatible operating systems: Windows ME Windows 2000 Windows XP 32bit Windows Vista 32/64bit Windows 7 32/64bit Mac OS 10.4+, Minimum system requirements: USB. Operating relative humidity range: 20 - 80 %, Operating temperature range (T-T): 5 - 35 °C. Colour of product: Black