Pet Dog Potty Training Door Bells Rope House training Housebreaking Anti Lost Description:    Item Type:Dog Door Bells   Material:Polyester,Iron Bell   Color:Black   Feature:Durable   Target Audience:Dogs   Length:34.25"/87 cm       Features:   1.You can prevent the dog from scratching the door and running out of the room,and the voice is clear and audible.   2.Four metal four buckles with adjustable 2 stall size is suitable for all types of dogs.   3.The thickening the webbing is durable and strong. The bell is of excellent quality and is not easy to rustle, and the voice is crisp.   4.The adjustable design solve all problem you worry, it can fit all types of doors.   5.Black is not easy to be dirty and is easy to clean.       Package Includes:   2pcs Dog Door Bells for Training Dog to Go Out       Note:   1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors.   2. Due to the screen difference, the color may be a little difference from what you expect, please allow it.