【Pet-Friendly】The air tag collar case is professionally designed for Apple Air tags 2021, So you can easily hang it on pet collars that are 5/8"-1" wide (It's a little big for small cats). It will not affect your pet comfort due to hanging and shaking. (Note: AirTags and collar not included.) 【Easy to install and remove】This Air tag dog & cat collar holder features a rotate lid design,it is easier to install and remove AirTag. Easy to use under cat and dog collars. 【NOTE】 TO PREVENT DROP-DOWN ACCIDENTS, PLEASE SCREW DOWN THE UPPER LID TIGHTLY. 【Waterproof seal design】This AirTag pet holder with a new sealing structure design, add silicone pad, Water-resistant, dogs&cats can swim with it. It can still keep your AirTags dry and dvoid AirTag damage due to water Ingress.Meanwhile, it has a sound insulation effect to prevent the sound of the AirTag from disturbing your pets. 【Premium Material】Airtag holder is constructed with durable plastic & silicone pad for a unique design that provides extra durability and comfortability. Compared with ordinary air tags protective case, it’s lightweight and stays tight with collar, no shaking at all, it's nearly impossible for pets to feel there is one addition on their necks. This makes the pet feel very comfortable when running. Safety, eco-friendly & highly durable. 【Universal Fit】 Our protective covers for Apple airtag covers meet all your needs, prefect fit on pets collars, backpack strap or hangbags strap, as well as children's school bags, handbags, luggage, etc. 【Package Included】: 2 PCS AirTag Dog Collar Case.