CASIO G-SHOCK - G-SHOCK Trivia Vol.04 “Solar-powered(Tough Solar)” Casio's proprietary solar charging system converts not only sunlight, but even light from weak light sources such as fluorescent lamps, into power. #casio #gshock #
Casio G-Shock G-5600E - A Solar Powered Square G-Shock - YouTube
Reviving a Tough Solar Watch with a Drained Battery - YouTube