PoochieBells The Original & Trusted Dog Housetraining Doorbell. Potty Dog Bells to Housetrain & Communicate With Your Dog : Handcrafted in USA Since 2005 : Endorsed by Pet Industry Professionals : Easy 95% Success Rate: Potty Training Instructions Included : Animal Kingdom Collection Easy to Train & Use Quickly - 95% success rate Reinforced bells which are extra smooth, snapped & looped safely into place so that they won't be pulled or fall off, heavy duty designer durable grosgrain ribbon, strategically placed for small and large breeds. No more whining, barking or waiting by the door! An intelligent, proven and highly effective training choice. Recommended by professional trainers. Training Instructions Included with Your Order. Portable, no batteries, wires, etc.