You can use multiple transmitters to extend your dog's range or to create a customized electric dog fence
containment area for your Petsafe PIF-300
Purchase an extra transmitter for your PetSafe Instant Electronic Pet Fence (IF-100) if you are looking to increase the current range of your PetSafe Instant Wireless Fence or if you need a transmitter at a second home. Using multiple transmitters can create overlapping containment areas that give your dog greater mobility. Keep in mind that the signals will cancel each other out where the circles intersect, allowing the pet to access the entire area. The transmitters can be located a maximum of 150 feet apart and each transmitter must be out of the weather, as they are not weather resistant.