COMPATIBILITY: Designed to securely hold and protect Apple AirTag tracking tag on your dog's existing collar FIT COLLAR SIZE: Airtag holder stays firmly attached to collars up to 1 inch wide, idealy for collar size in 3/4 inch and 1 inch IP68 WATERPROOF: Air Tag dog collar holder is made with premium silicone materials and waterproof lid can be wear in any weather condition DIY NAME STICKER: Incase the Airtag battery runout, you can wirte your infomation on the sticker, such like Your Name and Numbers EASY TO INSTALL: Simply install the Airtag, then DIY name sticker and transparency waterproof lid IP68 Dog Collar Holder