A twist of the wrist in weak light conditions automatically lights up the display backlight.
Low-temperature resistant (-10 C)
Even temperatures as low as -10 C have no effect on this watch.
A solar cell provides power for operation.
Radio signal reception (EU, USA, Japan, China)
Whether in Europe, North America and Japan or in the outer reaches of Canada, Central America and China-once the watch has been set to the local time, it receives the relevant signal and shows the correct time wherever you are. In many countries, it also sets itself automatically to summer and winter time.
A built-in direction sensor detecs the magnetic north.
10,000 m Altimeter
A pressure sensor detects changes in the air pressure and converts the result into an altitude up to 10,000 m.
The height gain sums all the meters you have climbed in a session, so that you can see at a glance the total ascent on a tour.
Altimeter data memory
Depending on the model, up to 40 sets of elevation data can be stored in the watch's data memory and re-accessed at any time. Each of these data sets consists of a measured altitude as well as the date and time. In addition to the individual altitudes, the maximum and minimum altitudes during a measurement are also stored.
A special sensor measures the air pressure (measuring range: 260/1100 hPa) and presents this on the display in the form of a symbol. This enables early detection of weather trends.
Thermometer (-10C / +60C)
A sensor measures the ambient temperature around the watch and displays it in C (-10C /+60C).
World time function
Displays the current time in major cities and specific areas around the world.
Stopwatch function-1/100 sec.-1 hour
Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 1 hour.
Timer-1/1 min.-1 hour
For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. The time can be set to the nearest minute and up to 1 hour in advance. Ideal for people who need to take medicines every day or those who do interval training.
5 daily alarms
The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. You can also activate hourly time signal that indicates each full hour. This model has 5 independent alarms for flexible reminders of important appointments.
Automatic hand adjustment
The automatic hand adjustment function checks the home position of the hands every hour and corrects it if necessary either by adjusting e.g. from shocks or using the influence of magnetism.
Button tones on/off
The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.
Once set, the automatic calendar always displays the correct date.
Times can be displayed in either a 12-hour or 24-hour format.
The tough, scratch-resistant mineral glass protects the watch against unsightly damage.
Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties.
Battery level indicator
An indicator shows the current battery level.
Water resistance classification (10 bar)
Perfect for swimming and snorkelling: the watch is water resistant to 10 bar / 100 metres. The metres value does not relate to a diving depth but to the air pressure used in the course of the water resistance test. (ISO 22810)
Type of battery
approx. 56,8mm x 49,3mm x 14,2mm (H x W x D)
approx. 90,0 g
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Casio Watch Pro Trek PRW 5100 1ERCasio Watch Pro Trek PRW 5100 1ER