The Poochie Bells Dog Doorbell has a designer grosgrain ribbon with durable rings and bells. Every Poochie-Bell comes complete with EASY training instructions as well as a super shiny dog bone charm.?Two sets of strategically-placed bells that are carefully folded and snapped securely into place. This design allows for all breeds (sizes) to reach the bells. Our bells are custom made especially for us and are crafted from heavy duty metal with a polished finish (not ordinary craft bells); so, they won?t be destroyed, ensuring your dog?s safety. Four bells on each Poochie-Bells unit allows you to easily hear them ring, but not so loud that they are overbearing. Top snap opens to fit and adjust for any door handle type. Great for travel, no messy installation, designed to hang over any doorknob. Endorsed and preferred by professional trainers and breeders. For dogs 10 weeks to 16 years+, all dogs can learn this behavior, bell train your dog in days! Handmade in the U.S.A. using durable ribbons and quality materials.