The PetSafe Rechargeable In-Ground Fence System is the convenient containment system that lets you keep your pet safe in your yard without having to regularly replace collar batteries. Charge your pet s receiver collar when the battery s low and away he goes to enjoy his new yard freedom. Add as many pets as you like with additional compatible collars. 4 adjustable levels of static correction plus tone-only mode for training lets you find just the right level for your pet. The fence installs in about a weekend with some basic DIY skills. You ll bury wires in your yard to set a custom pet area up to 25 acres with additional wire and flags. The Transmitter sends a radio signal through the boundary wire to your pet s collar. If your pet approaches the boundary he ll hear a warning beep to remind him to stay in the yard. If he continues through the boundary he ll feel a safe gentle static correction from the collar to keep him in the yard. After about 2 weeks of training your pet will quickly learn the areas