As usual i am always curious about stuff. So when i was passing by popular buying a paper shredder for the office I came across this fun device. There was this shelf and a tv displaying how it works. I bought the pest-stop 5000 and the portable model. The portable one ran on a button size battery. There was no indicator on it that was telling it was working. I didn’t know if it was working or not until my friend took the thing to his ear and said it was working due to the buzzing sound. As for the pest-stop 4000 it was plugged to the power socket, it had indicator lights and a test button so it was easy to tell if it was working.