Petsafe Instant Wireless Electronic Outdoor Pet Fence

No fence, no poles, no buried wire. This electronic fence can be installed instantly, covering up to 24,000 sq. ft. or half an acre. Instant fence emits a signal around your home to create a "safe zone" for your pet. White the lightweight receiver collar is receiving the signal, your dog is free to roam. When he approaches the boundary of the signal area, the collar emits a warning beep; if he leaves the signal area he receives a correction until he returns. Just plug the portable transmitter into any 110-volt outlet, place the collar on your dog and let him play. Transmitter signal penetrates walls and other obstructions, so it can be placed in your home or garage.