JUSTPET's Wireless Dog Fence Containment System is a good option for first-time wireless fence owners. It offers a radius distance ranging from 100 to 990 feet. To select a range, the consumer can choose from 10 adjustment levels set apart in increments of 100 feet each. Overall, JUSTPET makes it easy for users to set up their new fence. In addition, JUSTPET uses the latest technology to create a safe dog collar receiver. The collar receiver sends a painless, low-voltage signal if your dog gets out of range. It also turns off once the owner shuts down the main unit, allowing the dog to roam freely again. Wireless fence main unit Dog collar receiver Training flags Test light Power Adapter Charging cable Manual