CASIO PRO TREK — functional watches for outdoor enthusiasts
 

Tough Solar

Tough Solar System

The CASIO Tough Solar System is now so advanced that even the weakest light sources are sufficient to operate the watches. The solar cells are so small and inconspicuous that they can be integrated easily into every watch face design.
Intelligent energy storage
An accumulator in solar watches saves "superfluous" energy and releases it when the watch is in darkness. The accumulator is charged automatically and does not require manual activation.