The Casio Pro Trek PRW-3500-1CR is a full-featured outdoor instrument watch powered by Tough Solar with Multi-Band 6 atomic timekeeping. Its 56mm resin case houses Triple Sensor Version 3 â digital compass, altimeter, barometer, and thermometer â alongside sunrise/sunset data, world time, countdown timer, 1/10-second stopwatch, and four daily alarms. Built for serious outdoor use, rated to 200m water resistance.