How to Buy a Radar Motion Detector

Radar motion detectors emit a constant stream of microwave radiation and bounce that energy off the surroundings. The detector then compares the original signal to the reflected signal and notices changes caused by an object in motion. Here’s what to look for if you want to buy a radar motion detector.

Difficulty: Moderately Easy

Instructions

1. Plan out your use of the motion detector. Are you using this to trigger an automatic door, or just turn on a light? Different models will be better suited for different applications.

2. Pick models that have a range and coverage angle sufficient for your needs. Some radar motion detectors can be focused on specific locations, while higher end models can detect motion even through an intervening solid object.

3. Consider the advantages of hardwired power versus the convenient installation of battery powered models.

4. Look for a radar motion detector with a sensitivity control so you can screen out false alarms caused by pets.

5. Make a budget for the purchase. Do a quick browse of available models that suit your needs to get a sense of average prices. Indoor models currently range around $30 to $50 for basic no-frills radar. Add 10 bucks to couple the radar with passive infrared.

6. Scan the market for sales and special offers. Pick the best combination of price and features and complete the sale.

Tips & Warnings

• As passive infrared technology becomes cheaper and more widespread, radar motion detectors are becoming harder to find on the retail market. Consider purchasing a dual technology motion detector for the best of both worlds.
• Some manufacturers label their motion detectors as being powered by infrared radar. These models are simply infrared motion detectors that sense heat, not true radar motion detectors.
• Carefully adjust the sensitivity of your radar motion detector to avoid false alarms.