Powered by light energy 29.0mm diameter 8 Swarovski crystals Swarovski is a registered trademark of Swarovski AG 4 month power reserve once fully charged Water-resistant to 30 meters (100 feet) Caliber AS01 Gold-tone stainless steel Push button release clasp 3 year warranty on manufactory defects First year world wide warranty, 2nd and 3rd year only for USA