Wireless Freedom: The PetSafe Stay & Play Wireless Fence Replaceable Battery Receiver Collar adds additional dogs to your Stay & Play Wireless Fence system so your pets can safely enjoy outdoor play Safe Wireless Fence: With 5 adjustable correction levels and a tone-only training mode, this static collar tailors to your dog's temperament and reinforces positive behavior Adjustable Neck Collar: The waterproof, battery-operated receiver collar offers adjustable neck sizes from 6-28 in; 1 RFA-67 starter battery is included, with battery life lasting 1-2 months Global Mission, Local Care: With U.S. roots and worldwide reach, PetSafe delivers vet- and trainer-recommended solutions and exceptional customer support to create fields of joy for pets 25 Years of Trust: Since 1998, PetSafe has created safe, innovative, and trusted products that bring joy, enhance pet lives, and support the lifelong bond between pets and their families