I was using that little guy 20 years ago.. Was cutting edge at the time but only triggered once when the string was pulled. El Cheapo digital watch set-up. Boy it was something many many moons ago but I was hoping for something that monitored multiple deer occurrences. Seems like it would be a great idea.
I fugure If I got a trail with 20 deer moving by thats where Iwant to be regardless of whether they are bucks or does. Have does and the bucks will follow..

I have been known to just tie a light piece if thread across a trail. When a deer broke the string I knew something had moved thru and you can even tell which direction by how the thread ended up.