The Casio PRO TREK PRG-340-3ER is a solar-powered digital watch designed for outdoor enthusiasts. It features a duplex LCD for enhanced readability, displaying compass graphics on the top layer and time or measurements on the bottom. The watch includes a rotating bezel for simple orientation memory and a movable lug structure, allowing the case and band to lay flat for easy use with paper maps. Constructed with bio-based resin materials, it offers 10-bar water resistance and operates in temperatures as low as -10°C. Key functions include a digital compass, barometer, altimeter, thermometer, world time for 48 cities, sunrise and sunset times, a 1/10-second stopwatch with a 1,000-hour capacity, countdown timer, five daily alarms, and a Super Illuminator full-auto LED backlight. Reference number: PRG-340-3ER.