Panasonic WX-SA250P Operating Instructions Manual page 10

Precautions
Do not install the product where there is a risk of damage from seawater or
corrosive gases
Do not let foreign substances into the product
Do not replace parts while the product is installed
Do not install the product if the fixing bracket is deformed or the outer shell
is damaged
Do not attempt to disassemble or remodel the product
Entrust installation operations to a retailer
Entrust work in high places to a certified professional
Turn the product OFF before performing maintenance
Do not attempt to repair or wire the product while it is turned ON
Do not pull on cables and other components
Do not damage the cables
Do not install in places exposed to large amount of humidity and/or dust
Do not perform the installation and wiring work during a thunderstorm