Powered purely by any light source, this watch does not use traditional batteries. Through small solar panels on the watch dial, this watch charges fully after 8 hours in direct sunlight or 72 hours in artificial lighting. So never battery changes again! The simple and clean look of this steel watch will be an elegant addition to your wardrobe, whether you want to dress up a pair of jeans or go clubbing. If you love quality and great design this watch is for you. The name of the designer, Christian Mikkelsen, who created it, is engraved in the case back, reminding you that this is a true designer gem.