Solar powered watches have been on the market since the 1970's, with some unique designs to accomodate the solar cell array.  Since then, solar cell technology has created smaller, more powerful solar cells. Many companies make solar watches such as Seiko with Eco-drive and Casio with G-shock solar Watches.

Many use a lithium-ion recharable battery that will charge off of the sun or artificial light. A full charge will keep the watch running for months. Solar watches are a reliable, cost effective watch to own. Go green! Use solar!