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A house alarm. A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary (theft) or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and ...
Nest Secure was a home security system announced in September 2017. [77] The system consisted of Nest Guard (an alarm, keypad, and motion sensor with embedded microphone), Nest Detect (a door/window and motion sensor), and Nest Tag (a key chain fob). [78] The product was released in November 2017.
A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. PIR sensors are commonly used in security alarms and automatic lighting applications. PIR sensors detect general movement, but do not give ...
The wireless system also runs on lithium batteries, and can't be disabled by cutting the user's power. [32] As a standalone product, SimpliSafe systems function as a noise-only alarm system, emitting an 85-decibel siren. [33]
Car alarm. A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both. Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary ...
A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection). Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control, energy efficiency ...