RF Favero Fencing Foil mini Buzzer 2-prongNO MACHINE OR REELS REQUIRED! Plug this buzzer into the 2 prong foil socket of your electric foil (any brand or size) and youre off fencing electrically! Will indicate a buzzing sound for about 2 seconds every time the tip of your Foil is pressed (including the opponents guard). Thick metal casing will NOT break or dent easily. Measures about 1. 75 wide by 1. 5 long by 5 8 thick and weighing only a few ounces, it has a replaceable 12V (model 23A)