The Casio Pro Trek watch is one of the best-selling outdoor watches on the market. They have earned their popularity with a great price-quality ratio and a combination of durable construction with top equipment. Among the functions of the ProTrek watch you will find a compass, altimeter, barometer, thermometer, world times, power saving mode, alarm clocks, automatic calendar and display backlight. Some Casio trekking watch models are solar-powered and can easily withstand exposure to vibration, falls and low temperatures. Alternative names: Casio Protrek.