GPS-powered circular wireless boundary keeps your dog safe at home or on the go Quick, easy setup directly on collar’s LCD screen with no subscriptions or apps Adjustable coverage for any yard size larger than 3/4 acres Correction-free re-entry if dog passes the boundary 3 settings: Tone & vibration, small-dog static, large-dog static Water-resistant, rechargeable collar with up to 24 hours of battery life Fits dogs with neck sizes between 12 and 25 in., designed for dogs 20 lbs and up