YardMax offers the best, most reliable pet management system for the DIY customer and maximizes the amount of usable yard for their pets. Boundary wire is required, but sold separately. YardMax maximizes the amount of yard space for your pet to play freely in. Our most reliable and advanced in-ground fence system keeps your pet in your yard with a transmitter and rechargeable collar. You'll bury wires in your yard to set your pet's boundaries. When your pet nears the boundary, the collar will give a warning beep, followed by a static correction to remind your pet to stay within the boundaries. 5 adjustable levels of correction, plus tone are included on this fully waterproof, rechargeable collar. Covers up to 10 acres (with additional wire and flags sold separately) and supports an unlimited number of pets (with purchase of optional YardMax Receiver Collars - sold separately). Features Provides up to 30% more yard for pets to play Seemingly endless static correction zone Five adjustable levels of static correction plus tone-only or training Waterproof, rechargeable receiver collar Exclusive ReadyTest and PerfectFit test ensure that the receiver collar is ready and working Transmitter is powered to cover up to 10 acres with additional wire and flags (sold separately)* Supports multiple pets (additional PetSafe YardMax receiver collars required) Compatible with Pawz Away Mini, Indoor, Threshold and Outdoor Pet Barriers For pets over 5 pounds In the Box Transmitter with mounting hardware and power adapter YardMax rechargeable receiver with adjustable collar fits neck sizes 6” to 28” Surge protector Receiver collar charger—charges 2 collars at the same time Short and long contact points for short or long-haired pets Operating and training guide 50 Training Flags Waterproof splice capsules and wire nuts Test light tool and contact point wrench (Same as the PIG00-11115 Fence)