Can you recommend a driveway alarm?

Do any of you have a wireless driveway alarm? We have one but the company seems to have it more than we do and when we get it back it works just like it did before. Goes off intermittently for no apparent reason so that makes it totally useless and reliable. The brand is Guardline, we really like it when it operates properly so just wondering if there's one out there on the market that really seems to work.
We took a look at this comparison table: http://www.safehousetips.com/best-wireless-driveway-alarm-reviews/

BTY, Guardline has a lifetime warranty which I guess means they will work on at no cost for a lifetime!