An incredibly small key! Its volume is actually that of a USB plug: Wholesale 4 x 1 cm! There 'is no case or cover, and with his gray color, was quick to lose it, if we do not integrate with a key ring. What is surprising is that despite its small size, is in stacks and stacks, files including videos! Are stacked so we end up having to feel like an external hard drive, less expensive and less cumbersome (and arguably more reliable), although the final capacity is limited to 57 GB. Some reviews criticize the slow file transfers. I counted 15 to 20 seconds to transfer AVCHD video file of about 100MB We can certainly make faster, but the key remains, despite everything, a good value.