Sievers Pet Care Potty Time Chimes(R) in BlackOur Sievers Pet Care Potty Time Chimes(R) is the perfect potty training solution! Ring it on the inside.to be let outside. This easy-to-use potty training solution comes with an informational DVD with step by step instructions. These potty training chimes are also adjustable to fit the height of your dog. This potty training solution works for small breed puppies up to large breed adult dogs! Simply hang the Potty Time Chimes(R) on your doorknob. Every time you take your puppy outside to go potty, swipe your puppy's paw or nose across the bells and say "potty". Praise your furry friend for going outside. Your puppy will then associate ringing bells with needing to go outside to go potty. Housebreaking made easy!