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Get alerts when someone is nearby and protect your space from intruders at any parts of the home. The LED light indicators flash once when sensor was triggered. It flashes once every three seconds to prompt user to change the battery. The sensor applies digital dual-core fuzzy logic control processing technology and intelligent analysis algorithms and can distinguish interfering signals and body movement signals effectively to prevent false alarms. With built-in spiral high-frequency spring antenna, it has a far transfer distance and is environment friendly, energy saving, safe, reliable, and easy to install. Customers have used this system for everything from home security to patient care. It is also effective as driveway sensor and for driveway alarms.