With 25-acre coverage, help your pet learn property boundaries without the hassle of building a fence. Three adjustable levels of static correction are transmitted to your dog via the included waterproof, rechargeable receiver collar that's contoured to fit necks 8" to 28". Surge protection and battery backup keep your pet safe even when electricity fails. Exclusive ReadyTest™ and PerfectFit™ test ensure the receiver is ready and working before you send your pet outdoors. Order an additional receiver collar to use your In-Ground fence system with multiple pets. Designed for pets over 8 lbs. Includes: Transmitter with mounting hardware and power adapter, one rechargeable receiver and charger, surge protector, interchangeable contact points, contact-point training covers, training and operator's manual, 500 ft. of wire, 50 training flags, waterproof splice capsules and wire nuts, test-light tool and contact-point wrench. One-year manufacturer's warranty. Available: In-Ground Fence, Additional Receiver Collar.