Review on Wireless Underground Dog Fence System with Remote Dog Training Collar - Dual Function, Safe Containment, Waterproof Shock Collar - Pet Containment System with Extra Thick Durable Polyolefin 13 AWG Wire Fence by John Ghattamaraju

We bought this system because my very energetic new pup would easily jump over my yard fence and eat any plant available to her. With this system, she learned very quickly that she was not allowed to enter the garden. It was easy to install, had lots of wires for a very long border, and worked flawlessly for us. A year later we bought a second collar and were able to connect it to the same controller that came with that system. The only thing I would suggest is to watch the second collar pairing video closely. I got stuck on instructions until I called support. To pair a second collar, the controller's antenna must be touching or very close to the collar. Customer service was very helpful straight away, so this is the least of our criticisms. I definitely recommend this system.