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, brushed stainless steel, the finest straps in mesh or calfskin.