The BERING Slim Solar collection beats to the rhythm of nature! Because its energysource 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, brushed stainless steel, the finest straps in mesh.   Number of Batteries: 1 Features: Solar Powered, Quick Ship Battery Type: Lithium Ion Jewelry Closure: Fold Over Clasp Power Source: Battery (included) Watch Movement: Quartz Water Resistance: 50m Band Color: Purple Dial Color: Purple Metal Color: Two Tone Case Thickness: 8mm Case Width: 31mm Watch Band Length: 7 1/4 Inch Band Content: Stainless Steel Case Materials: 100% Stainless Steel Band Width: 10mm Care: Wipe Clean Band Type: Mesh Country of Origin: Imported Quick Ship items ship directly from the manufacturer within 3 to 5 business days. Photos are enlarged to show detail.