2 Short-Range Bluetooth Beacons & Electrical Stimulation Prongs. 2 Long-Range Bluetooth Beacons & Electrical Stimulation Prongs 1 Override Bluetooth Beacon (for going on walks and leaving the house with your pet). Main Pet Sensor System Device Box (w/ adjustable electrical stimulation button & bungee collar). USB C Charger Cable. Pet Sensor “Barriers Without Confinement” Indoor Dog Behavior Training System The innovative Pet Sensor System is a behavioral training tool to help teach your dog to stay off of certain pieces of furniture, leave guests that aren’t used to pets alone when they visit, stay out of certain areas of your condo/apartment/home, and so much more! Designed to be used in small spaces and not outside in the yard, the Pet Sensor System is unique in that it relies on an easy-to-use Bluetooth collar that is worn by the dog and employs a combination of vibration (buzz) and beeping (sound) and has an optional electrical stimulation feature (multi-level shock) for training larger or more stubborn pets. About the Pet Sensor System Device (PSSD) Our PSSD comes outfitted with several high-quality components that are easy to use and provide the best technology available for close-quarters pet training and correction. It uses three types of Bluetooth beacons including short-range beacons (S), long-range beacons (L), and a kill beacon (K) specifically for your dog leash. The kill beacon enables you and your pet to walk around the house without the correctional features enabled or when you take your dog for a walk.