Pet Safe Stubborn Dog In Ground Fence

New in Box. Not big enough for my yard. We did undo the line to see how far it stretched. Waterproof receiver collar for dogs 8 pounds and up, or neck sizes 6-28 inches. Covers up to 1/3 acre with included wire, expandable up to 25 acres with additional boundary wire (not included). 4 adjustable levels of static correction with highest intensity levels available, tone with vibration option alerts your pet with a beep and vibration. Run Through Prevention- Correction increases if your dog tries to run through the boundary zone. Low battery indicator Collar uses PetSafe 9-Volt PAC11-12067 battery (included).