I bought this item when a different picture was being displayed. The tracker tag appeared to be actaully enclosed. When this item arerived I was disapointed to find that the back of the rubber enclosure is open, and so is not waterproof. The item description does say splashproof which is fair enough, but the tracker tags should just be made waterproof so as to avoid this 'conveniently extra expense'.
They're a bit pricey for what they are, but they do the job well. I didn't think my cat would tolerate having this on her collar, but it's very light and soft so it doesn't seem to bother her. My cat once lost her collar much further away than I expected, and I found it weeks after it was lost, with the tag still working having been protected by the case from the weather!
Simple to drop the beeping thing inside and it stays there. The two things together then are perfectly sized to be attached to the cat's collar, where with one cat it regularly gets heavily splashed - this hasn't been a problem. So they do the job very well!
We needed this for the dog as he tends to disappear chasing rabbits and is more than capable of digging into burrows. This gives us a basic idea of his direction if he does get into trouble, Works fine.