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 security game with precision and durability!

BUILT TO LAST - Engineered for over 1 million cycles, ensuring long-term peace of mind.
PLUG PROTECT - 33cm wired length for flexible, easy installation on any door or window frame.
POWER EFFICIENT - Operates safely at 0.5A and up to 100V, maximizing energy efficiency without compromise.
SLEEK DISCREET - Compact 29x15.5x9mm ABS design blends seamlessly with modern interiors.
PRECISION SENSING - Detects door/window status within a 10-15mm range for reliable security.

The Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm features a compact magnetic reed switch design with a sensing distance of 10-15mm. Built from durable ABS material, it supports up to 1 million activation cycles, operates at 0.5A current and 100V voltage, and includes 33cm wiring for versatile installation. Ideal for professional-grade home or office security setups.

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Battery Description	Battery not included
Voltage	100 Volts
Control Method	Remote
Mounting Type	Wall Mount
Maximum Range	15 metres
Sensor Technology	Contact Sensor
UPC	726972605882
Manufacturer	Gebildet
Country of Origin	USA
Item model number	DE453
Product Dimensions	2.9 x 1.55 x 0.9 cm; 50 g
ASIN	B085XQLQ3N

Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black,Magnetic Door Sensor, Normally Open Magnetic Switch

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