I've had this http://www.amazon.com/Driveway-Life...=8-2&keywords=guardline+driveway+alarm+sensor for about 2 weeks now and haven't had a false alarm yet. I had a cheaper $35 one from Home Depot that false alarmed all the time. Animals will set it off however, but I changed the setting to dusk-dawn since animals aren't as active in the middle of the night. We've had a guy door checking and breaking into some cars and I'm fed up. Caught him on video twice, 1st time he broke the pet door off the side door trying to get in, 2nd time he noticed the camera and flipped if off. Jerk. Now I'll know as soon as he's heading up the driveway and I can be more prepared. Still don't know what I'll do when that night comes though....
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