We have the Dakota Alert IR detectors and they are wonderful.
I have the metal detector probe version around my property to detect vehicles. Had them for ever 8 years and replaced the Lithium batteries once, they do last a long time and can go the distance on a large property. A 700ft long driveway would be no problem for them. They might be on the pricey side for $200 a set (transmitter/receiver) but they are built to last and the transmitters are designed to last outdoors. A lot of stuff isn’t even if they manufacturer claims it is