Soft silicone cock ring set with lead wire. These flat rings are each uni polar. The black part inside is conductive. To achive shock therapy you need to use both rings together or replace one of the rings by a self adhesive gel pad. The lead wire has a 2.5 mm jack plug which fits to our 3 different power box units ref. # 7850, # 7880 and # 7890.Make sure that you use enough contact gel to create the best contact with the skin.