COMPATIBLE WITH WIRE ANTI-RUNAWAY FENCE SYSTEM: This Collar is compatible with the brand’s Anti-runaway Fence Systems such as the Deluxe Wired Runaway Fence for Small Dogs with Anti-runaway Collar (PIG20 -11041), the Anti-Escape Fence with Wire for Dogs (PRF-3004W-20), the Anti-Escape Fence System with Wire for Medium or Large Stubborn Dogs (PRF-3004WX-20), the Anti-Escape Fence with Deluxe Anti-Escape Collar with Wire (PCF-1000-20), Premium Buried Radio Fence and Terrestrial Fence for Cats ADJUSTABLE COLLAR TO YOUR DOG: This Nylon collar has been specially designed for dogs of 3.6 kg minimum and this adjustable collar to ideally adapt to your dog’s neck circumference (between 15 and 66 cm) ANTI-FUGUE COLLAR: This lightweight (73 grams) and waterproof collar triggers a warning Audible sound when your pet approaches the established perimeter, followed by safe static stimulation if it attempts to cross the boundary (4 n adjustable progressive levels of static stimulation and a beep-only