The BERING Slim Solar collection beats to the rhythm of nature! Because its energy source is environmentally friendly and infinitely available: light! Not only sunlight but any kind of light is converted into electrical energy by the solar cell under the face and stored in a rechargeable secondary battery. No battery change is required as in quartz watches. The watch has a power reserve, so that - once fully charged – it runs for 6 to 12 months. Even if it is stored in complete darkness during this time. Scratch resistant sapphire crystal and ultra light titanium case and strap. Collection: Solar Category: watch Gender: male Glass type: flat sapphire crystal Movement type: solar Case color: brushed silver Case material: titanium Case length: 45 mm Case height: 8 mm Case width: 39 mm Case diameter: 39 mm Case type: oval Strap color: silver Strap material: titanium strap with titanium links Strap length: 170 mm Strap width: 21 mm Clasp: folding clasp Link material: titanium Dial color: Blue Water Resistance: 10 ATM