Silvercrest SLNB 401 A1 - Manual (Page 57)

Universal Quad LNB SLNB 401 A1
English - 55
Never perform any work on antennae during a thunderstorm!
Make sure that your antenna system has the necessary lightning
protection and ground connection!
The supplied device do not contain any parts that require user
maintenance. Never open the housing of the device.
Always make sure that:
 contact with abrasive liquids is avoided and the device is never
operated near water, and it must especially never be
immersed;
 no foreign bodies enter the device;
 the device should not be subject to excessive shocks or
vibrations.