A new purchase as I prepare for another prolonged yard sale. The previous device “quit” so a replacement was required (imho). The two (2) Boltz are far more sensitive and pick up a squirrel on my porch and/or vehicles driving on the adjacent street. I’ve repositioned the sensor several times and can’t seem to resolve the frustration of hearing the alarm every time a vehicle drives by. The previous purchase (more than a year ago) was valuable to advise me of yard sale customers. ~~ Honestly, I haven’t a teaspoon full of energy for preparation for a yard sale. I’m not very effective on two hours sleep!!