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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🔒 Secure your space, effortlessly and endlessly.

ENERGY EFFICIENT - Operates without batteries, reducing maintenance and environmental impact.
PRECISION SENSING - Detects door/window status within a 10-15mm range for reliable security.
EFFORTLESS INSTALLATION - Compact 29x15.5x9mm design with 33cm wire length fits seamlessly into your smart home setup.
LONG LASTING DURABILITY - Engineered to withstand over 1 million operations, ensuring years of dependable protection.
UNIVERSAL COMPATIBILITY - Supports 1-100V operation with a max power of 10W, perfect for diverse security systems.

This embedded wired magnetic door/window sensor features a precise 10-15mm detection range, compact dimensions, and a robust lifespan exceeding 1 million cycles. Battery-free operation and broad voltage compatibility make it an ideal, maintenance-free choice for professional-grade security systems.

Color Name	ブラック-NC
Batteries Included	No
Batteries Required	No
Brand	Gebildet
Manufacturer	Gebildet
Item Model Number	E332
Material	ABS
Mounting Type	ドアマウント
Package Dimensions	17.4 x 11.4 x 3.5 cm; 70 g
Item Weight	0.07 Kilograms

Gebildet 埋め込み型有線セキュリティウィンドウゲートコンタクトセンサーアラーム磁気リードスイッチブラック、磁気ドアセンサー、ノーマルクローズ磁気スイッチ 5個

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