Well my "wireless" drive way alarms usually last about 10-12 years. The effectiveness kind of fades after that.
They are kind of high maintenance and heavy to lift. They usually weight in at about 60-70 lbs. The colors have been different from one model to the next.
Here is a picture of the latest one. He was just a few months old then. He is about twice the size now. LOL
Now to actually answer your question. I have tried several brands of the wireless alarms. None of them have worked very well. They seem to give too many false alarms. I went back with a hard wired one. It works much better. It is a Dakota Alert brand. They sense the metal in a car/truck/tractor.