The Casio Pro Trek PRG-340-1ER is a 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 incorporates eco-friendly biomass plastics in its case, case back, and band, derived from renewable resources like castor oil and corn. Key functionalities include a digital compass, barometer, altimeter, thermometer, sunrise and sunset times, world time for 48 cities, a 1/10-second stopwatch, countdown timer, and five daily alarms. It is solar-powered, water-resistant up to 100 meters, and operates in temperatures as low as -10°C. The PRG-340-1ER measures 54.7 mm in length, 51.7 mm in width, and 15.1 mm in thickness, with a weight of 54 grams. Reference number: PRG-340-1ER.