Review on 🚨 Guardline ¼ Mile Long Range Wireless Driveway Alarm: Weather Resistant Motion Sensor & Detector for Ultimate DIY Security Alert System, Ideal for Monitoring & Protecting Property, Yard, Garage, Gate, Pool by Mark Adlesh

After narrowing down my choices to this unit and one with a recessed probe, I bought one of these to try. The price for this one is much lower and the installation is pretty easy. There are other driveway monitors on the market, but I needed one with more range than most (my house is about 100 yards from my driveway). In the first few hours after installation I had 3 false positives and a couple of "failures". where the device has not detected a vehicle that has passed 6 feet in front of it. I changed the sensitivity settings a couple of times but that didn't solve the problem. Before giving up and returning the item, I decided to try a few things to resolve the issues. For the initial setup, I placed rechargeable NIMH batteries in the sensor assembly and mounted it on a wooden stand about a foot away. Steel fence post and about 3 feet above the edge of the steel livestock fence. Since the manual states that low battery voltage can cause consistency issues, I replaced the NIMH batteries with new alkaline batteries (which have a slightly higher voltage). I also moved the sensor to a location further away from steel poles and livestock. Guards (in case of disruption) as well as a few meters from the roadway. In the week following these changes we have seen no "missed" vehicles and only 3 or 4 "false" alerts. False alarms can easily be caused by the movement of deer or birds in front of the sensor, which is one of the disadvantages of this type of motion sensor. I'm cautiously optimistic for now and hope this system continues to work well for us. I'll reset the sensor shortly to see if the next steel pole (or steel livestock shelter) was there. really a problem. I suspect the issues are due to the lower voltage of the NIMH batteries, which is disappointing. Their voltage isn't much lower than new alkaline batteries, and good electronic design shouldn't be as sensitive to battery voltage. The only other negative observation noted here by other reviewers. To change batteries or change settings inside the sensor, you must remove 4 small screws and separate the main body of the sensor from the mounting plate, being careful not to loosen any of the screws. This procedure is not at all convenient and is not suitable for devices that require on-site maintenance.