The PetSafe Stubborn Dog In-Ground Fence System is a durable, customizable solution designed for the determined dog who loves freedom, but needs boundaries. This invisible pet containment kit includes 500 feet of durable fencing wire that can be used to create your custom in-ground fence, enough to cover up to 1/3 acre. It can be expanded to 25 acres with the purchase of additional wire, making it ideal for both small and large outdoor spaces. Setup suggests 2 people over a weekend. The waterproof, 9-Volt alkaline battery-operated receiver collar features a tone-and-vibration-only mode for training or hearing impaired dogs and 4 adjustable static correction levels, making it easy to tailor the training to your dog’s temperament. 1 battery is included. The collar is designed to fit neck sizes from 6-28 inches, ensuring a secure and comfortable fit for dogs 8 lbs and up, 6 months and older. Visual cue boundary flags help guide your dog during the training process, which typically takes just two weeks. This multi-pet training system supports additional collars for households with more than one dog. With a dog-friendly fence layout tailored to your yard and customizable static settings for even the most persistant of pets, the PetSafe Stubborn Dog In-Ground Fence System is a trusted, DIY-friendly electric containment system that keeps your pet safe, happy, and free to roam. Since 1988, PetSafe has been driven by a simple belief: safe, healthy pets lead to happier lives for pets and their families. For over 25 years, we've been dedicated to enhancing the lives of pets and the people who love them, treating every pet as a cherished family member and delivering life-changing innovations designed to enrich every moment. With U.S. roots and a global reach, our vet- and trainer-recommended products are built for every pet and backed by exceptional customer support. From backyards to dog parks, we're on a mission to create fields of joy for happy, healthy, and safe pets.