Amazon.com: GA2100 4th/5th Mod Kits, GA2100 All Metal Watch Band Strap Bezel Replacement Accessories for Casio Mens G-Shock GA2100/GA-2110, Men's Watch Modding Replacement Accessories Set : Clothing, Shoes & Jewelry
Casio 5611 Module | G-Shock GA-2100 series watch time set-up & functions demo - YouTube