The biggest problem with making an interactive electrical cache is providing a reliable power source. But if you bring the battery, we both can have some fun!
There is a gizmo hiding at the first waypoint that will yield the co-ords of the cache when tickled the right ways with your nine volter. (Remember, you will need two numbers...) If you can't find the gizmo, or it won't work for you, the final cachebox hiding spot isn't hard to find. It's lurking in a 'Candy-Booted' sheltered spot quite nearby. No bush-bashing required! And it isn't hiding!
A WORD OF WARNING ABOUT 9 VOLT BATTERIES!: Don't allow the terminals to come into contact with metallic objects! This will short circuit the battery and flatten it. It will also create a fair amount of heat. So putting your battery in the glovebox or your pocket with things like keys or spare change is not a good idea.
Some manufacturers sell them with a little plastic 'keeper' to protect the terminals. Keep the keeper! Or put some tape over the terminals or pop the battery in a plastic bag. Then you will be safe and can continue logging BYOBs!
(This cache was placed with the permission of the Denmark Shire.)
IMPORTANT!: I've had a request from the Shire to tell all geocachers NOT TO DRIVE VEHICLES ON THE TRAIL! If this persists I will have to remove all the BYOB caches. Please don't be the idiot who kills these popular caches!