Havahart Wireless Radial-Shape Select Dog Fence Waterproof Extra Collar New and improved collar - now waterproof! Great for use as a back-up collar, or to contain a second dog Can be used with Havahart wireless radial-shape2 or radial-shape select dog fences Battery cap with easy-to-read lock and unlock icons Fits dogs with neck sizes from 14 to 26 inches