Stay & Play Wireless Fence Replaceable Battery Receiver Collar - Give yourself peace of mind knowing all of your pets are secure in the yard with the Stay & Play Wireless Fence Replaceable Battery Receiver Collar. Purchase additional collars for every dog in your family or as a replacement collar for your compatible wireless fence. Great for dogs 5 lb and up Collar is ergonomically designed to be comfortable for your pet to wear Purchase additional collars for every dog in your family  5 levels of static correction plus a tone-only mode Collar strap adjusts to fit neck sizes 6-28 in  Waterproof collar Uses a RFA-67 replaceable battery which lasts about 1-2 months (battery included)