Excellent working condition!! Selling because they are no longer needed. These Invisible Fence “Rocks” have an adjustable radius that’s works with Invisible Fence Brand Fence system. Invisible Fence® Brand's Outdoor Shields Can Help!! Outdoor Shields create adjustable Invisible® barriers that let you protect your yard and pet. Fully compatible with your Invisible Fence system, Outdoor Shields add an additional level of custom protection. Trying to keep your dog from swimming in your pool or protect your cat from falling in? With an adjustable circular signal field up to 12 feet in diameter, Outdoor Shields Solutions will keep your pets out of the pool, no matter the size. This way your dogs can go for a swim on your terms.Our Outdoor Shields Solutions blend naturally into your landscape and create Invisible Boundary® protection. The rock-like shields protect around your landscaping, as well as keep your pet from accidentally eating harmful plants or compost. Control where your dog poops! Not only do you want to protect your landscaping, but allowing your pet to poop in areas like a vegetable garden can be unsafe for you. Outdoor Shields can help. 4 D batteries are required (not included)