Silvercrest SOUND SPOT Bedienungs- Und Sicherheitshinweise Seite 56

WARNING!
Wireless interference?
Switch the product off on airplanes, in hospitals, service rooms, or
near medical electronic systems. The wireless signals transmitted could
impact the functionality of sensitive electronics. Keep the product at
least 20 cm from pacemakers or implantable cardioverter defibrillators,
as the electromagnetic radiation may impair the functionality of
pacemakers. The radio waves transmitted could cause interference
in hearing aids. Do not place the product near flammable gasses
or potentially explosives areas (e.g. paint shops) with the wireless
components on, as the radio waves emitted can cause explosions and
fire.
NOTE: When using the product it is recommended that ALL cables
(USB / AUX) are less than 3 meters in length to avoid any interference.
GB/IE 57