The Casio Pro Trek Watch – Blue/Red (PRTB50-4D) is a great choice for climbers, hikers, campers and other outdoor enthusiasts. Direction bezel Double LED light 100m water resistance Built-in Bluetooth Quad Sensor (thermometer, altimeter/barometer, digital compass, step counter) 38 time zones Sunrise and sunset time display 1/100-second stopwatch Countdown timer and 5 daily alarms Hand shift feature Full auto-calendar (to year 2099) 12/24-hour format The Casio Pro Trek PRTB50-4D Watch has a Quad Sensor system that uses compact sensors, making it possible to pack compass, altitude/barometer and temperature measurements, along with an accelerometer that keeps track of your step count, into a compact configuration. You can also perform a watch button operation to record your current location in memory.