ADD ON / REPLACEMENT Collar for Arf Pets Bark Control Training Collar, IPX6 Water Resistant, Adjustable for Small, Large Breeds, black Collar can be used as a replacement or as a second Collar to work with Arf Pets Bark Control Training Collar Powerful Transmitter Boasts 300-Meter Range Collar Syncs with "Arf Pets" Transmitter to Deliver Off-the-Leash Training for Up to 2 Dogs. Lightweight. Discreet. Water-resistant. The collar fits loosely but securely around your pal's neck for as little discomfort and interference as possible.