Pet Safe Instant Wireless Dog Containment Fence System PIF-300
Product Review (submitted on July 16, 2012):
one thing to keep in mind with this fence is that it can only be configured as a circle. For my yard it barely gave my dog room to go around the house and I had to swap it out for the inground wired one. Fortunately they were willing to do the excahnge no problem, but to save yourself some time and headache - do not buy this unless your area can be a complete circle!