Are you certain these switches are normally closed ? The picture of the light circuit indicates they are normally open, without magnet.

You are correct. Almost all of the reed switches on Amazon universally have the NO/NC descriptions backwards. Even the guy who responded to you about his RV steps was mistaken as his application would require a normally closed switch (ie. door opening and removing the magnet would allow the current to flow). I think the big misunderstanding is these vendors (and some people) think the "normal" position is with a magnet adjacent the reed switch. It is not.

Can this be used in a 12v application? I wanted to use ground to trigger a negative input(car alarm application)

Yes, I am also using it for 12V lights. You limit is going to be the 0.5amp load.

Are these waterproof or at least water resistant?

Yes . It is water proof . Just only wires connection for sensor ( over 10'' long) must be in dry area.

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🔐 Elevate your space with stealthy security that never sleeps.

BUILT TO LAST - Engineered for 1 million+ cycles ensuring long-term reliability without fail.
PLUG PROTECT - 33cm wired connection for easy installation with included screws and stickers.
POWER EFFICIENT - Operates at low 0.5A current and max 10W power for energy-smart security.
PRECISION SENSING - Detects door/window status within a 10-15mm range for flawless security.
SEAMLESS INTEGRATION - Compact 29x15.5x9mm design fits discreetly into any window or door frame.

The Gebildet embedded wired magnetic door/window sensor offers precise detection within 10-15mm, a compact ABS build, and ultra-durable performance rated for 1 million cycles. Designed for professional-grade home or office security, it operates efficiently at 0.5A and 100V, ensuring seamless integration and reliable alerts to keep your environment safe and smart.

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