Introducing the new SportDOG Brand® SDF-100C In-Ground Fence System. The smaller and sleeker Collar Receiver features a Li-Ion battery that charges in two hours and has a one to two month battery life. Now featuring seven levels of static stimulation as well as vibration and tone, its easier than ever to keep your dog safe and secure. With 1, 000 feet of wire and 100 flags, you can contain an area as large as 1 1/3 acres (or up to 100 acres with the purchase of additional wire and flags). Multiple dogs? Simply purchase additional collars. Dependable in any environment, the collar is DryTek® - waterproof and submersible to 25 feet. Waterproof Collar Receiver features 7 levels of static stimulation Fence Transmitter features built-in lightning protection & wire break alarm for added safety Collar Receiver features rechargeable Li-Ion battery with 1-2 months battery life | PetSafe SportDOG Brand ® Rechargeable In-Ground Fence System