PetSafe Stay and Play Fence Receiver Collar Works with the original PetSafe wireless fence, PIF-300 Receiver collar strap fits neck sizes 6 to 23-inch Provides 5 levels of static correction along with a tone-only mode for training Fits dogs weighing 5-pound or more Pass-through receiver allows you to use any length of collar strap that is non-metallic and 3/4 inches wide