Casio G-Shock Trend Essentials Adventurer Stone Series GM-S5640GEM-7ER
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 (