It is a specialized, open source wallet for the storage and use of bitcoin transactions with an excellent security.
It has features that make it highly competitive:
As I mentioned it is open and verifiable code, it can also be adapted.
Security process that deciphers fake wallets.
Flexible transaction rates, it is possible to define the fees amounts.
You have full control of your assets since you have access to your private keys
Encryption to the maximum with password set by the user.
In general it is one of the best mobile wallets for bitcoin, it is easy to use and has unique features that make it highly secure. It is open source as I mentioned but is that this makes it 100% verifiable, the vast majority of users who have used it praise it. And above all it is decentralized.
Although I would also like a desktop version, and it would be incredible to be able to store or spend other cryptocurrencies or at least the most important ones.