【Really Waterproof】This Dovick Case Includes waterproof structure and ring,you can put them in water.Compatible with Apple Airtag(not included). 【Ultra Durable Holder Compatible with Airtag】With 4 special screws to close the case, the itag will never fall off from the case.The need a special screwdriver(included) to open, it is anti-theft. 【Anti-scratch and Shock-proof】Full Cover for Air Tag, soft stretchy and hard-wearing TPU material. There are raised parts at the four corners of the shell, which can play an anti-fall effect. 【Keychain Design】Anti-lost with keychain design,it is convenient to hang the itag to your bag,key ring,key ,dog collar, backpacks, luggage,schoolbag and so on. 【Signal and Sound】No signal block,sound maybe a little smaller than uncased air tag. Dovick- Waterproof Keychain Holder Case Compatible with Airtag,Screw Full Cover Compatible with Apple Air Tag Tracker Key Ring (Mix 4 Pack)