Silvercrest SFK 16 A1 - Manual (Page 11)

Wireless Doorbell SFK 16 A1
English - 9
RF Interface
Place the device at least 20cm (8 inches) away
from pacemakers, as the RF signals may
interfere with the functionality of the pacemaker.
The transmitted RF signals can cause
interference with hearing aids. Do not place the
device with the wireless adapter turned on near
flammable gases or in an explosion-sensitive
area (e.g. a paint shop), as the transmitted RF
signals may cause explosions or fire. The range
of the radio wave signals depends on
environmental conditions.