PetSafe In-Ground Fence, 4-Correction Level, Pet Minimum Weight: 8 lb, 6 to 26 in Neck, Battery Power Source, Alert Type: Alarm, Includes: Fence Transmitter, Surge Protector, Power Adapter, 500 ft Boundary Wire, (2) Wire Nuts, (50) Boundary Flags, (2) Gel-Filled Capsules, Battery, Test Light Tool, Long Contact Points, Receiver Collar