Safe and effective for pets over 2.3 kg, this fence will keep your little pup safe in your yard. Our smallest waterproof collar is designed specifically for comfort. The reflective strip on the collar helps you find your small dog at night, so outside playtime doesn't have to end when the sun goes down! A radio signal is sent through a buried wire, marking the boundaries you wish to set for your dog. As your dog approaches the boundary, the dog’s Receiver Collar issues a warning tone. If he continues into the boundary, your pet receives a safe but startling electrical stimulation from the Receiver Collar. While harmless, the stimulation will persuade him to stay in the containment area you’ve established. The system offers 4 levels of static stimulation plus a tone-only option, adjustable to your dog’s temperament.