Springy metal hanger with brass bell. * When your dog touches the bell it make a pleasant ringing sound that can be heard at least several rooms away. * Easy for the dog to ring using his paw or nose. No worries about a toenail getting caught as in a jingle-type bell. * Mount on wall next to a doorway using picture hanging Velcro (not included) or screws (not included) at a height that"s easy for your dog to reach. * Great for dogs of all ages and sizes.