Casio Protrek Tough Solar Radio Controlled Triple Sensor PRW-3100Y-3 Men's WatchCasio Protrek Tough Solar Radio Controlled Triple Sensor PRW 3100Y 3 PRW3100Y 3 Men's Watch When you feel the need for a device that will give you accurate information without stressing you out, the Casio Protrek jumps into the scene. Smarter than any of the so called smart watches, it is the choice of smart outdoorsmen who are willing to face a harsh Sun, blizzards and soggy conditions that would almost instantly turn other watches lame.