This collar is compatible with all PetSafe® wireless fence systems to safely keep your pets in the yard with no digging and no wires to bury. Its adjustable boundary covers up to 1/2 acre (180 feet in diameter) for pets over 5 lb with neck sizes from 6 - 28 inches. The PetSafe® Stay & Play® Wireless Fence with Replaceable Battery Collar has 5 levels of static correction so you can customize to your pet's temperament. Also has a tone only mode for training. It sets-up in 1-2 hours making it perfect for RV camping and vacation homes. Operating range may be affected by a variety of factors including terrain, topography and metal objects. The Pet Area cannot be changed into a square or rectangular shape. Comes with easy to install batteries - RFA-67 battery - which has a 1-2 month expected life. 5 Levels of Static Correction Waterproof Receiver Collar Portable with Easy Set Up | PetSafe ® Stay & Play ® Wireless Fence with Replaceable Battery Collar