Tangem

Tangem is a hardware wallet for storing cryptocurrencies. It is shaped like a credit card and uses NFC technology to communicate with your smartphone. This makes it very portable and easy to use.   

Key Features : 

Security: Tangem stores your private keys offline.

Convenience: Tangem is very easy to use.

Durability: Tangem is water-resistant and can withstand extreme temperatures.

Open source: The Tangem app is open source.