PetSafe Rechargeable In-Ground Fence System - Give your dog freedom to safely play off leash in a secure yard without having to regularly replace batteries in his receiver collar. The Rechargeable In-Ground Fence System has a rechargeable battery that lasts up to 2 months with each charge. Rechargeable collar quickly charges in 2-3 hours and lasts up to 2 months depending on use Kit includes 500 ft of wire to fence in a 1/3-acre yard Expandable up to 25 acres Waterproof collar Collar has 4 levels of adjustable static correction plus a tone-only mode for training Purchase additional receiver collars for every pet in your family Adjustable collar strap fits neck sizes 6-26 in