If you already have your dog fence wire installed and need to replace your current dog fence transmitter and collar you can use the PetSafe Stubborn Dog Radio Fence Without Wire and Flags. You can replace any current dog fence pet containment system. The PetSafe Stubborn Dog Radio Fence features the Stubborn Dog Collar - The most powerful collar available anywhere! We recommend this dog fence if your dog is over 30 pounds and is extremely stubborn or hard to train. The PetSafe Stubborn Dog Collar has five levels of correction plus vibration in the warning area for an added deterrent and a low battery light to let you know when to replace the battery. The collar with the PetSafe;Stubborn Dog Radio Fence is compatible with the PetSafe Indoor Radio Fence Transmitter. You can use the Indoor Radio Fence to control your pet's movement and access to areas of your home where you may not want him to go. Includes: TransmitterStubborn Dog Receiver with BatteryAC AdapterOwners Manual