I bought this hoping to keep the rats & mice away from hanging out on my battery... we shall see. It’s installed right on top of the battery and wired directly. I have not (yet) installed the accessory wire so it’s always ON.
I also removed the hood liner so that it would not absorb the sound from the MouseBlocker.
Update: 9-Sep-15
Well overnight some various crap appeared on my battery. No droppings but still.. it doesn’t work 100%.