BK241AA#AC3 HP BK241AA#AC3 HP BK241AA#AC3 Back up fast with the high-speed USB 2.0 transfer rate and integrated software Keep tabs on the storage with the power and drive activity LED indicators Compatibility: any USB-enabled PC or notebook; HP Pavilion PC with HP Pocket Media Drive bay running Windows 7, Vista, XP home, Professional, or Media Center Edition USB 2.0 B- to A-type cable and Carrying Case included Compact, just 3.18 x 0.63 x 5.38" and less than 1 lbs