I had a Casio G Shock solar watch that proved to give me great service, find a copy of Casio's "Operation Guide 3155" on their website, under Manuals.Need to know how something works and you've lost your manual? Get some of the manuals here! Watches. G-SQUAD PRO. Smart Outdoor Watch A database for all G-Shock lovers. Thousands of G-Shocks. Manuals in up to 12 languages. G-Shock Youtube videos. And much more