Telematrix SP-300 Spectrum PLUS User Manual page 37

Keep the telephone dry. If it gets wet, wipe it dry immediately.
Liquids might contain minerals that can corrode the electronic
circuits.
Use and store the telephone only in normal temperature
environments. Temperature extremes can shorten the life of
electronic devices, damage batteries, and distort or melt plastic
parts.
Keep the telephone away from excessive dust and dirt that can
cause premature wear of parts.
Wipe the telephone with a damp cloth occasionally to keep it
looking new. Do not use harsh chemicals, cleaning solvents,
or strong detergents to clean the system.
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