The Best Motion Sensors and Home Security Gadgets Without Cameras

Security cameras are cheap and abundant, but many folks are uncomfortable with the idea of a video feed showing the inside of their home. Even as a security camera reviewer, I get it. The risks add up quickly, whether it's vulnerabilities exposing your video feed to the internet, powerful microphones picking up your private conversations, or overzealous companies sharing video with the surveillance state .

The good news is you don’t need a camera to secure your home or detect intruders. I tested several motion sensors and alternative systems that can alert you of activity just as effectively without sacrificing your privacy.

(If you do happen to be OK with a more conventional approach to home security, check out my recommendations for the Best Indoor Security Cameras , Best Outdoor Security Cameras , and Best Video Doorbell Cameras .)

This radar system is ideal for protecting larger properties, with its range of up to half a mile and adjustable detection zone. It’s old school: With no Wi-Fi or app needed, you simply turn on the receiver and pair the detector. It then sounds an alarm whenever a person or animal moves into the area. You can pair up to six detectors with the receiver (though you only get one), and they are IP65-rated, so they’ll survive just fine in any weather. Each additional detector costs $120 , so it could be quite an expensive system. By default, the detection zone is a rectangle around 20 x 17 feet. You can extend it up to 50 feet, though I found the process outlined in the manual a bit fiddly and unclear (you have to move within the detection zone and press the right buttons).

After testing in a couple of outdoor scenarios (side passage and backyard), I was impressed by this system. It reliably picked up and alerted motion by people and my cats without being triggered by wind causing movement in the bushes. This could be handy for guarding the exterior of your home, outbuildings, or even for protecting your campsite or RV on trips. The downside is that the 3,000-mAh rechargeable battery needs topping off every five or six days. You can plug a power bank into the USB-C port, but for fixed outdoor installations, you might consider snagging a wee USB-C solar panel.

This gadget is ideal if you have a specific cupboard, cabinet, or drawer you want to protect; maybe somewhere you keep valuables or medication, or perhaps a gun safe. It has sensors inside to detect movement in any direction, and you can simply place it, attach it with the steel cable tether, or stick it somewhere with adhesive. It only connects to 2.4-GHz Wi-Fi , but it is highly configurable. You can set the sensitivity, cool-down period between alerts, axis monitoring (x, y, and z), and have it send alerts via the app, email, or text message. It is configurable via your web browser if you don’t want to use the mobile app.