G Shock GA 100 (module 5081) User manual and a VERY detailed functions overview - YouTube
Casio G-SHOCK GA100CF-1A | Top 10 Things Watch Review - YouTube
R.I.P. my GA-100 😓 After 10 years of service it died because of water after a battery change by a shop. looking forward to buying a gw 7900 : r/ gshock