Bob, The cheap motion detectors just don't work. I've been through several of them and now have a $350 one that works "OK". Essentially, these things ain't ready for prime time.
Since they all work off heat detection, they can't be used when the temp is over 90 degrees. The max distance advertised is 60 feet. I haven't gotten one to work over 40 ft. maximum. They take pictures of everything so you may run out of film long before you get the picture you want. They have a high rate of theft. Think about it. If I slip onto your property and see the damn thing, I am probably going to take the evidence with me. No matter how I conceal it, there is a flash and click.
That said, I am hooked and can't wait until October to start it going again on deer, coons, bobcats, coyotes, rabbits and of course, crows and neighbors dogs. It did confirm that 90% of wildlife movement is at night and that my neighbors dogs are all over my land during the day.
I do know one guy that got a picture of a neighbor stealing from his barn. Luckily, it was daytime and the thief didn't see the camera.
They can be checked out and compared at
www.Jesseshuntingpages.com. Dave