Available in three sizes:
small (5.79 inches / 147mm), medium/large (6.77 inches / 172mm) and extra-large (7.76 inches / 197mm).
Includes two easy-to-insert links (.32 inches / 8mm and .63 inches / 16mm) for a fine-tuned fit
USB charging cable and sizing tool included
Optimized for the web (Mac OS X v10.6 and above / Windows XP, Vista, 7 and 8). Works on Android and iOS devices (iPhone 4S and above, iPod Touch 5th generation and above).