Nest 9 Electric Fence Advanced - Latest All Weather Pet Containment System - In Ground & Above Ground InstallationSMART WATERPROOF COLLARS: The included waterproof collar tracks your dogs distance from boundary and progressively increases the correction as it approaches. Warning TONE, VIBRATION and a progressively increasing STATIC correction is perfect for timid pups all the way to stubborn creatures. The Advanced Hidden Fence lets you tailor training to your pup's personality by sensing behavior and movement. ENHANCED SAFETY FEATURES: We made absolutely sure