Silvercrest SHU 3.1 A1 - Manual (Page 36)

SilverCrest SHU 3.1 A1 HDMI switch
4 - English
objects filled with liquids such as vases or drinks on or near the
device);
 the device is not in the immediate vicinity of magnetic fields
(e.g. speakers);
 no fire sources (e.g. burning candles) are placed on or near the
device;
 no foreign objects penetrate the device;
 the device is not subjected to any extreme temperature
fluctuations, as this may result in moisture caused by
condensation and therefore a short circuit;
 the device is never subjected to excessive shocks and
vibrations;
Cables
Always handle the cables by the plug and do not pull on the cables
themselves. Do not place items of furniture or any other heavy
objects on the cables and ensure that they are not kinked,
especially near the plug and the connection ports. Never make
knots in any of the cables or tie them together with other cables.
Ensure that all cables are placed so that no one can trip over them
and they do not cause an obstruction.