Runtastic GPS Watch with Heart Rate Measurement, Operating Instructions Manual

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2.5 Avoid from Magnetic Fields
Do not wear the watch near powerful magnetic fields (e.g.
transformers) as they can alter the watch’s ability to accurately
track time and location and lead to deterioration of the watch.
2.6 Operating Temperature Range
The GPS-watch can be operated in a temperature range from 32 °F
to 122 ° F, and stored at 14 °F up to 140 °C. Avoid high temperatures
(e.g. in stopped vehicles or under direct sun influence) and
sustained humidity.
NOTE:
Display problems at 14° F up to 32° C are usually due to the cold
temperature and are not a malfunction of the GPS-watch. The
electro-chemical processes of the batteries and watch accumulator
are strongly influenced by environmental temperature. The lower
the temperature, the more powerfully the processes are influenced
during discharge. That is why you should note that at temperatures
below freezing, the battery may "freeze" which could lead to
reduced battery life.
2.7 Battery Care
Your GPS-watch operates on a permanent lithium-polymer battery.
The chest strap operates on a lithium battery 3V CR2032.

Do not remove the GPS watch battery.

Do not expose the GPS watch to direct heat sources, or high
temperature environments, e.g. direct exposure to sunlight in a
vehicle.

Do not perforate or burn the GPS-watch.