SECURE A 1/3 ACRE YARD: Create a safe 1/3-acre play area for your best friend with the included 500 feet of wire; Purchase additional wire to fence in up to 5 acres\n4 LEVELS OF CORRECTION: A tone-only mode plus 4 levels of adjustable static correction help keep your dog safe in his play area\nDIY INSTALLATION: This do-it-yourself weekend project lets you create a fence that fits your yard s shape and size\nCOLLAR FIT: The Deluxe UltraLight In-Ground Fence Receiver Collar is waterproof and comfortably fits dogs 8 pounds and up and adjusts to fit neck sizes 6-26 inch; For dogs 6 months and older\nPROTECT ALL YOUR PETS: If you have more than 1 pet purchase as many collars as you need so every furry friend can safely play in their yard\nBattery-operated collar: The collar has a low battery indicator and uses replaceable PetSafe RFA-67 battery; Battery is included\nContain all your pets: With the purchase of additional collars, this in-ground fence system allows you to safely contain an unlimited number of pets\nCompatibility: Works with all PetSafe in-ground fence receiver collars except YardMax receiver collars