This is not just a black piece of plastic like it appears. This is a Wrong Number Generator. Attach it to someone’s phone line and when they try to call a number, it will actually dial a different number. It has both a phone plug connection and spade connectors so you can either connect it inline with the phone or somewhere much harder to find.
Think of how much you could annoy someone with this thing. To make it even more of a nuisance, it will let the actual number be connected 25% of the time. Just to throw them off.
Product Page ($89)