Hitachi S10mini User Manual page 7

Fasten the mount base to a vertical surface. Fastening the mount base to a
horizontal surface lessens the heat dissipation effects and allows the
temperature to rise, thereby rendering the module defective or incurring
component parts deterioration.
Before installing the module, discharge any static buildup from your body
because static electricity may render the module defective.
Properly tighten the screws. If they are inadequately tightened, malfunction,
smoke emission, or combustion may occur.
Do not disassemble or modify the module. Failure to observe this precaution
may result in a fire or cause the module to become defective or malfunction.
REQUIREMENT
PROHIBITION