Deluxe Fence No Wire PUL-275 Collar, by PetSafe

He'll hear a warning tone as he nears the boundary you've established and a quick correction if he attempts to cross it. The lightweight, adjustable collar is the perfect complement to the newfound freedom your dog will experience on his old turf.

Features:

Waterproof UltraLight™ receiver with adjustable collar

Covers up to 10 acres (additional wire and flag kits required)

Works with multiple pets (additional receiver collars required)