Replacement/Spare Part - Additional/Replacement Collar & Receiver for RopriPet Active Collar Training System - 505iRP & 505iRP-2 Replacement for lost or damaged collar & receiver Additional collar to allow for training of 2 dogs simultaneously Will suit the following RopriPet Active Collar Models: 505iRP, 505iRP-2, 506i and 506i-2 Will NOT suit RopriPet Active Collar Pro Models: 606i and 606i-2