Beurer PM 26 Operating Instructions Manual page 23

Replacing the batteries
The battery of the HR monitor may only be replaced by a specialized
dealer (any lock-maker's shop) and at the service address provided.
You can replace the battery in the chest strap on your own. The
battery compartment is located on the inner side. Use a coin or the
battery to be used to open the compartment. The positive pole of the
battery inserted must face upwards. Carefully close the battery com-
partment again.
Used batteries do not belong in the household gar-
bage. Dispose of these through your electronics
dealer or your local collecting point for recoverables.
You are legally required to do this. We will find this
symbol on batteries containing toxic chemicals:
Pb = battery contains lead
Cd = battery contains cadmium
Hg = battery contains mercury
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