Pescadore is spot on on the bottle caps. First time or two out they drove me nuts, but once I created adjacent programs in 12khz and 4khz as well as set up my own 4 & 5 tone patterns they are mostly a thing of the past. The wireless system makes it easy to set the coil up in the garage with a box of bottle caps, pop tops, can slaw etc... while holding the remote unit in your hand like a calculator and using the other hand to swing trash over the coil. After I spent an hour or so working with all the trash I was able to tweak my setting to resolve most of them.
Then I went out into my yard where I have the angled PVC tube type system where I am able to lower a coin in 1/4" increments, this allowed me to tweak my reactivity and sensitivity settings to my liking. After completing these two tasks, I was ready to hit the parks.
HH
Enjoy your Deus
Robert