Beurer PM 25 Operating Instructions Manual page 29

Interference from other devices for measuring heart rates
The HR monitor as a receiver can react to interfering stray signals
such as other heart rate monitors within a vicinity of one metre. This
can result in incorrect measurements particularly when training in
groups. If you e.g. job next to one another, it can be beneficial to
wear the HR monitor on the other wrist or to increase the distance to
one's training partner.
Warranty
We provide a two-year warranty from the date of purchase for
material and manufacturing defects in the product.
The warranty is not valid:
in the event of damages due to improper use
for wearable parts such as batteries or the wrist band
for defects that are already known to the customer at the time of
purchase
due to fault on the customer's part
The warranty does not affect the customer's legal assurances. Proof
of purchase is to be provided by the customer for the assertion of a
warrant claim within the period of warranty. The warranty is to be
asserted within a time frame of two years from the date of purchase
vis-à-vis Beurer GmbH, 89077 Ulm, Germany.
In the event of warranty, the customer is entitled to the repair of the
product at our own workshops or at those authorized by us.
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