PetSafe Rechargeable In-Ground Fence for Dogs and Cats over 5lb, Waterproof Receiver Collar with Tone and Static Correction SAFE AND CUSTOMIZABLE - create a customizable area for your pets to safely play UP TO 1/3 OF AN ACRE COVERAGE - expandable up to 25 acres with the purchase of additional wires and flags (sold separately) RECHARGEABLE, WATERPROOF RECEIVER COLLAR - quickly charges in 2-3 hours with each charge lasting up to 2 months depending on use ADJUSTABLE RECEIVER COLLAR - with 4 levels of static correction and tone, fits pets 5 pounds or more with neck sizes 6 to 26 inches ADD UNLIMITED PETS - with the purchase of compatible PetSafe In-Ground receiver collars (Excludes YardMax and UltraSmart) SURGE PROTECTOR - helps protect your transmitter from lightning strikes and powers surges Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs at 1-800-732-2677 or by email at ccc3@petsafe.net Manufacturers warranty is only valid when purchased from an authorized retailer