Amazon.com: Casio Mens G-Shock Digital Watch, with Quartz Digital Movement, and Multi-Function Alarm, Stopwatch, and Countdown Timer, Hourly Time Signal, Auto Calendar, Water-Resistant to 200 M (660 Feet) : Clothing, Shoes &
Casio] W-800H. Modified to have a countdown timer function!!! : r/Watches
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Amazon.com: Casio Mens G-Shock Digital Watch, with Quartz Digital Movement, and Multi-Function Alarm, Stopwatch, and Countdown Timer, Features Hourly Time Signal, Auto Calendar, and 12- and 24-Hour Formats, Water-Resistant to 200 M (