Keep your pet playing safely within boundaries created by the PetSafe Rechargeable In-Ground Fence System free to enjoy the backyard without any worry for you of escape or harm. The system uses four adjustable levels of static correction with automatic safety shut-off that shuts off correction after 15 seconds. Tone-only mode alerts your pet with a beep. Run-through protection increases if your dog tries to run through the boundary zone. Waterproof, rechargeable-receiver collar fits dogs 5 lbs. and larger with neck sizes measuring 6-26. Purchase additional receiver collars to add an unlimited amount of dogs to the system. System covers up to 1/3 acre with included boundary wire. Add additional wire to expand coverage up to 25 acres. System includes rechargeable, receiver collar, receiver charger, transmitter with power adapter, surge protector, 50 boundary training flags, 500 ft. of boundary wire, wire nuts, splice capsules, test light tool, and operating and training guide. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Containment Systems.