The Petsafe Stubborn Dog Stay+Play Wireless Fence Rechargeable Collar can be used to add multiple dogs or as a replacement collar for your dog fence system. This Petsafe Wireless Fence dog collar features 5 levels of static correction at a higher intensity for hard-to-train dogs. There's also a tone-only mode for training. The 3/4" wide collar is lightweight and comfortable, and fits dogs 5 lbs. and over, with neck sizes 6" to 28". The pass-through loops on the receiver allow you to switch out any 3/4'" dog collar that suits your pet. The set includes a waterproof, weatherproof receiver with batteries that recharge in 2 to 3 hours, battery charger, and instruction manual. The Rechargeable Collar is Compatible with the PetSafe Wireless Containment System (PIF-300 system, IF-100 transmitter) and Stay+Play Wireless Fence (PIF00-12917). Manufacturer model #: PIF00-13672. 5 levels of static correction Ideal for tough-to-train dogs Tone-only mode for training Waterproof and submersible up to 5' Rechargeable battery charges in 23 hours Pass-through receiver allows you to switch-out collars For dogs weighing 5+ lbs. Includes instruction manual and charger