Know something is out there.
This is my second Guardline 1/4 mile driveway monitor. The first one with 2 sensors. One on house driveway and other nearly 1/4 away on the farm.
The farm sensor never missed. It worked so well that someone smashed it.
The driveway at the house worked well after being adjusted for distance. The cattle in field were setting it off. The cold weather came and the sensor slowed down sending the signal. Up to 30 -45 seconds of delay before the alert would go off.
Brought it in installed new batteries, cleaned the IR, re-paired to the receiver. Multiple interactions with the vendor. After 2-3 days and no luck. I bought another one. This is a different frequency so it is not interchangeable with old one.
Guardline is manufacture that builds the most useful driveway alarm I've found. The first one was here and working for 5 years. It is easy program, and supplies outputs, of 12 volts, along with normal open/closed. The receiver is the house, but also rings in the barn at the house.
This new system has 4 sensors. I'm currently using 3 sensors on the house driveway. The is roughly 400 feet long, flat ground with nearly clear sight to the house. First as close to the road as I can. At roughly 250 the driveway splits and circles to the house. Sensors 2 and 3 right passed the split. A vehicle at normal speed allow for enough notice. I can look out at side that the alert was sent from. It allows. Me to ask, who drove up to the barn. The forth one is going to monitor the area of meat shop. Wife didn't like it at first, but when it quit she liked even less. She wanted to know how soon can you fix it.
If you want a unit that does what it was designed to do. Do yourself a favor and invest in the best, buy a Guardline.
This
Verified purchase: YesCondition: Pre-owned