The first Citizen Eco-Drive watches, which are light powered watches, were sold in 1995 There is an amorphous silicon solar cell behind the dial that charges a titanium lithium-ion rechargeable secondary battery

Casio has long been regarded as a leader in the field of personal technology Since its founding in April 1946 the company has remained on the cutting edge of digital technology, creating some of the earliest portable calculators and popularizing digital and analog quartz watches among a broad consumer market