PetSafe in-Ground Fence Kit for Dogs SAFE AND CUSTOMIZABLE - gives your pets room to play with up to 1/3 of an acre coverage, expandable up to 25 acres with the purchase of additional wires and flags (sold separately) LIGHTWEIGHT RECEIVER COLLAR - designed for dogs over 8 lb. with neck sizes from 6 to 26 inches ADJUSTABLE, WATERPROOF RECEIVER COLLAR - features 4 levels of static correction plus tone-only mode for training LOW BATTERY INDICATOR - 1-2 month expected battery life depending on use with easy to install RFA-67 battery CREATE KEEP-OUT AREAS - you can create additional boundaries around areas such as gardens, pools, and swing sets in your yard SURGE PROTECTOR - protect your In-Ground Fence from surges or spikes 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