Casio Pro Trek PRG-340-3

Venture into the great outdoors with a solar-powered TREKKING PRO featuring eco-friendly materials that respect the environment. The PRO TREK line of authentic outdoor watches for nature lovers introduces the PRG-340, a model that incorporates biomass plastics with low environmental impact*, while maintaining the same comfortable fit on the wrist. The urethane case and band are made from biomass plastic with castor oil, while the biomass plastic band is made with corn. The duplex LCD features separate levels for compass graphics and watch functions with a larger compass display for improved readability and easier navigation in a beautiful and functional design. The rotating bezel simplifies logging compass readings, while the Tough Solar system keeps advanced features powered on the go. Get out and explore with less environmental impact! * Biomass plastics are polymers produced using chemical or biological synthesis from plant-based materials or other renewable organic substances, and are widely understood to help reduce environmental impact and promote a transition to a circular economy.

Case size (L × W × H): 54.7 × 51.7 × 15.1 mm
Weight: 54 g

Case and bezel material: Bio-based resin
Band: Biomass plastic soft urethane, adjustable from 145 to 215 mm
Water resistance: 10 bar
Low-temperature resistance: down to -10 °C / 14 °F

Power supply: Solar powered

Altimeter: -700 to 10,000 m (-2,300 to 32,800 ft), 1 m (5 ft) unit, manual memory up to 30 records with altitude/date/time, automatic max/min altitude data, cumulative ascent and descent, trek data up to 14 records, relative altitude from -3,000 to 3,000 m, measurement intervals 5 seconds or 2 minutes

Barometer: 260 to 1,100 hPa (7.65–32.45 inHg), pressure tendency graph for the last 42 hours, pressure difference graph, barometric pressure change alarm

Digital compass: 16 directions, measurement 0°–359° with 1° precision, continuous measurement for 60 seconds, graphic direction pointer, bidirectional calibration, magnetic declination correction, direction memory

Thermometer: -10 °C to 60 °C (14–140 °F), 0.1 °C / 0.2 °F precision

Glass: Mineral
Bezel: Directional

World time: 31 time zones (48 cities + UTC) with daylight saving on/off

Sunrise / sunset: Sunrise and sunset display for specific dates

Stopwatch: 1/10-second with capacity up to 999:59'59.9'', elapsed time, split time, 1st and 2nd place times modes

Countdown timer: Up to 24 hours in 1-minute and 1-hour increments

Alarms / hourly signal: 5 daily alarms (1 with snooze) and hourly time signal

Lighting: Full auto Super Illuminator LED with selectable duration (1.5 or 3 seconds) and afterglow
Light color: White

Calendar: Full auto calendar up to 2099

Mute function: Button operation tone on/off

Power saving: Auto display off in the dark

Battery indicator: Battery level indicator

Run time: Approximately 7 months without light exposure after full charge, up to 27 months with power saving active

Accuracy: ±15 seconds per month

Other functions: 12/24-hour format, full display of hour, minutes, seconds, PM, month, date, and day of the month

Display: Duplex LC