Every driveway alarm kit gets a score from 0 to 100% built from five factors, which maps onto the 5-point rating shown on the site (a 0% score would be 1.5 stars; a perfect score, 5). Each factor is scored against fixed reference points, not against the other products in the list, so adding a new model never moves another model’s rating. Kits are grouped by sensor type, motion and beam sensors or vehicle-only sensors, and use the same scale in both groups.
| Factor | Measures | Weight |
|---|---|---|
| Wireless range | maker's claimed sensor-to-receiver range | 30% |
| Value | price per sensor in the box | 25% |
| Features | phone alerts, relay output, solar sensor, battery receiver, per-sensor alerts, sensitivity and IP rating | 25% |
| Expandability | most sensors one receiver takes | 10% |
| Warranty | warranty length | 10% |
Where the numbers come from
Range, detection distance, sensor limits, features and warranty come from the maker’s product page or manual, or from the maker’s own copy on a retail listing. When a maker’s figures conflict, the one on the maker’s own product page is used, and the product page notes the difference. Prices are checked at Amazon and the maker’s own store, and the lowest price at a store the page links to is used.
The factors
Wireless range is the maker’s claimed distance from sensor to receiver, on a log scale, so doubling the range always counts the same: 400 ft scores zero and one mile (5,280 ft) full marks. Every maker quotes open-air range. Trees, hills and buildings shorten it, so treat the figures as a way to compare kits rather than a promise.
Value is the current price divided by the number of sensors in the box, on a log scale: $300 per sensor scores zero and $25 per sensor full marks. A break-beam pair counts as one sensor. Vehicle-only sensors cost more to make, so they score lower here than motion kits, and the two groups are ranked separately for that reason.
Features is 25% for phone alerts over Wi-Fi, 15% for a relay or 12 V output that can switch lights, a siren or an alarm panel, 15% for a solar-charged sensor, 15% for a receiver that runs on its own battery (portable, or backed up through a power cut), 10% for per-sensor alerts that tell you which sensor tripped, 10% for adjustable sensitivity and 10% for a published IP weather rating.
Expandability is the most sensors one receiver accepts, on a log scale: 2 scores zero and 32 or more full marks.
Warranty is the maker’s warranty: none scores zero and 3 years full marks.
What isn’t scored
Detection distance, hose length, sensor battery type and life, receiver count, operating temperature and release date are listed but not scored. Detection distance isn’t comparable across sensor types: a motion sensor’s reach, a beam’s spacing and a probe’s radius measure different things.
Missing data
Wireless range is the factor that most separates these kits, so a kit whose maker doesn’t publish one scores zero for range and the product page marks it as estimated. A maker that doesn’t publish a warranty also gets no warranty counted, which scores zero and is marked estimated. For the other factors, a figure that isn’t published gets the neutral middle score (50) and is marked estimated. Features score neutral only when none of them is published; a feature the maker doesn’t mention otherwise counts as absent.
Ties and discontinued models
Products are ranked by score within each group. Discontinued models stay listed but rank below every current model and can be hidden with the “Hide discontinued” filter.