This In-Ground Fence™ System is one of the most affordable ways to keep your dog safe and secure in his own backyard. From the Receiver Collar, he’ll hear a warning tone as he nears the boundary you established followed by a quick electrical stimulation if he attempts to cross it. The lightweight, adjustable collar is the perfect complement to the new-found freedom your dog will experience on his own turf. Wire CalculatorFeatures Safe and Customisable - Gives your pets room to play with up to 1,335 square metres coverage, expandable up to 101,171 square metres with the purchase of additional wires and flags (sold separately) Lightweight Receiver Collar - Designed for dogs over 3.6 kilos with neck sizes from 6 to 26 inches Adjustable, Waterproof Receiver Collar - Features 4 levels of static stimulation 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 Safe, Effective, Trusted - Our static collars are part of our ongoing mission to provide the best tools, education and support for pet parents seeking safe, successful, expert-recommended options to meet each dog’s unique training needs