The Wireless pet fence offers twice the coverage of any other wireless system on the market, so don't be fooled by the imitators. If you can plug in a cord, you can install this Wireless Pet Fence! This wireless fence has no unattractive poles to set up and no wires to bury. Instant wireless dog fence uses a constant radio signal to create a "safe zone" for your pet
http://www.petstreetmall.com/Portable-Containment/7490/619/Wireless Dog Fence and with FREE SHIPPING on the Petsafe Wireless Fence.