Flat illustration of a motion sensor casting striped detection beams: a person walking across the beams is detected, a person walking straight down one beam is missed

How Motion Detectors Work — and Why Yours False-Triggers

A PIR motion detector does not detect motion. It measures the change in infrared energy between two opposed elements as heat crosses the gaps between lens beams. That single mechanism explains why it misses someone walking straight at it, why it fires at sunbeams and heating vents, and why it goes half-blind on a hot day.

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SimpliSafe Glassbreak Sensor, white wall-mounted acoustic sound-detection glass break sensor

Best Glass Break Sensors 2026: Which Sensor Technology Fits Your Home

Glass break sensors close a gap door/window contact sensors can’t: catching a smash-and-reach entry that never opens the frame. We compare 4 real options — SimpliSafe, Ring, Aqara Zigbee, and a standalone no-hub pick — across acoustic vs. vibration technology, hub requirements, and honest limitations.

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