Motion Sensors & Detectors Deals

Cheap motion sensors for indoors and out

If you're after cheap motion sensors, this page lists PIR, microwave and dual-tech detectors for indoor and outdoor spots. Battery and hardwired models can trigger lights, alarms, chimes or camera recording, and pet-immune settings help households with dogs and cats avoid false alerts.

Cheap motion sensors: how to choose one for your home

• Read the detection range and angle, and place each sensor where people walk across the field rather than toward it.
• Pet-immune sensors ignore animals under a set weight, which cuts false triggers in homes with cats or dogs.
• The sensor must work with your existing hub, app, or alarm panel, since wireless protocols differ between systems.
• Motion-activated lights switch off when no one is around, which can use less energy than lights left on all night.

Which suits you: Renters may prefer wireless plug-and-play sensors tied to an app, while homeowners with alarm panels may want compatible hardwired detectors.

About this guide: written by DealsVanta as general buying advice. Last edited Oct 26, 2026.