G Shock GA 100 (module 5081) User manual and a VERY detailed functions overview - YouTube
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Amazon.com: Casio Men's G XL Series Quartz Watch Strap, WR Shock Resistant Resin Color: Black and Blue (Model: GA-100-1A2CR) : Clothing, Shoes & Jewelry
Casio G-Shock GA-100 Smart watch User Manual
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How to set up Casio G-Shock GA-100 (user manual, user guide)