We've had several versions of these over the years. The original ran off a 9v battery or 2xD cell batteries (we had 2 models) . Both were excellent. We now have a USB rechargeable one. I'm less impressed with that one, but Australian regs don't actually permit the one we loved in Australia sadly. It did give a nasty kick.I typed it manually in the search engine & it came up. I have one that's shaped like a tennis racket. The batterie went dead.
This is a UK Amazon link. We had the executioner pro model and the executioner. We preferred the pro version. I'm not familiar with the revenge, that's a newer model.
Let's put it this way, if I could source it in Australia, it is what I'd be purchasing.