This collar is compatible with all PetSafe wireless fence systems. With 5 levels of static correction and a tone-only mode, your pet will remain safe and secure in their designated play space. The waterproof design of this collar allows your dog to wear it rain or shine. Use this collar for dogs that weigh 5 pounds or more and who have a neck size between 6-28 inches. The Stay & Play Wireless Fence collar comes with a built-in rechargeable battery and a low battery indicator. The collar quickly charges in just 2-3 hours and lasts up to 3 weeks depending on frequency of use.