The rubber cover is for the protection of the remote. It will prevent the remote from taking damage from normal abuse (dropping, rubbing, scratching, etc...) It is not a permanent solution for re-attaching a broken remote to your keychain.
This fits remotes with the following FCC ID and Part Numbers: HYQ2AB, HYQ2EB, 13510242, 13580812, 13594028, 13598511, 13598512, 13594029 and 13580794.
The following vehicle can use this silicone cover when equipped with the factory remote:
Cadillac Escalade (2015-2020).