20 Pack White Door Window Security Alarm Contact Surface Reed Home Switch Sensor

They protect entrances into banks, tech companies, retail stores, casinos, military bases, and businesses everywhere... Security door contact sensors. These sensors provide the very first line of defense in safeguarding millions of people, and billions of dollars in assets, each and every day. But - Can they be trusted? The core technology component inside virtually every door contact... is the magnetic reed switch. And we'll show you the basic notion of how it works. The door contact is installed into the door frame, which houses the magnetic reed switch inside of it. A corresponding magnet is affixed into the door. When the door is opened, the magnet on the door moves apart from the door frame, causing the sensor's output to engage into an alarm state. But there is a major vulnerability that exists with all reed switches: A reed switch will respond to magnetism that is sensed from any