This premium pet barrier collar is completely waterproof and submersible so if your dog goes swimming, it won't cost you another replacement collar. You can save even more money with the included battery that lasts up to 2 years by not purchasing extra batteries often. The 8 programmable levels are great for more sensitive dogs that requires gentle training so they don't get scared, and for stubborn dogs that needs stricter training even without a physical fence. The casing is made out of high quality poly-carbonate material to withstand hard bumps and dog chewing. In case your dog still chews through the outer shell and damages the collar, we will replace the collar under an industry first, Dog Chew Warranty.