![HomeMatic HM-Sec-Sir-WM Скачать руководство пользователя страница 49](http://html.mh-extra.com/html/homematic/hm-sec-sir-wm/hm-sec-sir-wm_installation-and-operating-manual_2153820049.webp)
49
Maintenance and cleaning
9
Maintenance and cleaning
This product does not require you to carry out any
maintenance other than replacing the batteries when
necessary. Enlist the help of an expert to carry out any
maintenance or repairs.
Clean the product using a soft, lint-free cloth that is clean and
dry. You may dampen the cloth a little with lukewarm water in
order to remove more stubborn marks. Do not use any deter-
gents containing solvents, as they could corrode the plastic
housing and label.
Protect the product from the effects of damp, dust and direct
solar radiation.
10 General information about radio
operation
Radio transmission is performed on a non-exclusive transmis-
sion path, which means that there is a possibility of interfer-
ence occurring.
Switching operations, electrical motors or defective electrical
devices can also cause interference.
The range of transmission within buildings can differ
greatly from that available in the open air. Besides the
transmitting power and the reception characteristics of
the receiver, environmental factors such as humidity in
the vicinity have an important role to play, as do on-site
structural/screening conditions.