The SONE040 is designed for "fit and forget" reliability. Because it is solid-state (no moving parts), there is very little mechanical wear and tear. Regular testing via the control panel is usually all that is required to ensure the unit is functioning correctly. Its UV-stable housing ensures that even when placed near windows or bright lights, the plastic won't become brittle or lose its color over time.
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Rated IP66, meaning it is dust-tight and protected against powerful water jets.