PetSafe Wireless Dog Fence - PIF-300
Protection your dog can't jump over or dig under. Installs instantly. No unattractive poles or wires to bury. Constant radio signal creates Safe Zone. Low Battery Indicator tells you when battery is dying. Covers up to a 90-foot radius. The Wireless Fence is a revolutionary new concept that provides the safest simplest form of pet containment ever. You plug in a transmitter somewhere inconspicuously in your home. It emits a radio signal. Your pet wears a lightweight receiver collar which listens for the signal. While it is receiving the signal your dog is free to run and play.