1.Bracelet USB: Rubber.
2.Size: 63×65×8mm.
3.Weight: 26g.
4.Capacity: 128MB-4GB.
5.Read speed USB 2.0:>15MB/second.
6.Write speed USB 2.0:> 3MB/second.
Plug and play.
USB 2.0, supporting USB 2.0 high-speed (480 Mbps).
Data retention 10 years minimum.
Working temperature: 32°F -140°F (0°C-60°C).
Compatible with Window 98/98SE/ME/2000/XP,Mac OS(10.3x above),Linux Kernel (2.6 and above).
Lifetime warranty (please find details in warranty policy).