Seiko is commited to their clean energy concept, which is focusing on developing a new eco-friendly watch. An important part of this concept are these Seiko Solar watches. In 1977 Seiko introduced its first solar watch. Since then the concept has evolved and improved. Today Seiko has come so far, developing a watch with an ultra-efficient solar cell, which works on all kinds of light – both natural and artificial - energy. That is why the (chargeable) battery of this watch lasts much longer.