1.Great for pet dog potty training, housetraining and houserbreaking; Betty way for the communication between your pets and you. 2.Not only can be a pet dog doorbell, but also can be a service bell/doorbell for stores, restaurants, bar and hotel. 3.The pleasant chime sound is loud as well as clearly without noisy sound, which can be heard at a distance. 4.is attached to a strong springy band, smooth without any slot to hurt their pets when they need to ring the bell. 5.High quality solid metal hanger with brass bell; 3 screws are included to install it on the door or wall easily.