This is the same type transmitter that they use on released animals that they wan't to track down again. Also the same kind they put on hunting dogs. About time they come out with this system for arrows. Can't imagine the price being very resonable right now. Also have a hard time believing that this design would not affect arrow flight. And only on average 100 yard reception, I think they could have done better........................................... On a side note how about putting a couple of these inside of some feed, you would be able to track down your game[:-]