COVONO Electric Dog Fence, Wired Pet Containment System, Aboveground/Underground Installation, 650 Ft Wire, IP66 Waterproof Rechargeable Collar, Shock/Tone Correction, 1 CollarCOVER UP TO 3 4 ACRE: Our system comes with 650 feet of boundary wire, which is thicker and more flexible than previous versions, allowing you to cover up to 3 4 acre. You can easily expand your coverage by purchasing additional wires and lay them in any shape to keep your dog safely contained EFFECTIVE DOG TRAINING: The boundary is established by signals emitted from the wire by the transmitter. As your dog approaches the boundary, the receiver emits