Ladies Solar Powered Seiko Watch. 25.5mm. Black Ion Watch. Water resistant to 30 meters. Our SKU # is 11-7201-009. Seiko Solar watches collect energy from any light source and convert it into electrical energy. This energy is stored in a rechargeable lithium ion cell which takes the place of a conventional watch battery. From there, the watch operates like any other quartz watch. 3 fold-Push button release clasp.