
I Like that it works on iphones with lightning jacks.
Multi-protocol support: This YubiKey offers multi-protocol support including FIDO (U2F, FIDO2), Yubico OTP, OATH-TOTP, OATH-HOTP, Smart Card (PIV), OpenPGP and challenge response capability to ensure strong hardware-based authentication. Protect your login credentials and protect your Gmail, Facebook, Dropbox, Outlook, LastPass, Dashlane accounts and many more. FIDO: YubiKey 5Ci is FIDO-certified and supports Google Chrome and any other FIDO compatible application on Windows, Mac OS or Linux. The Lightning connector, on the other hand, is innovation-oriented and is currently compatible with a limited number of applications. Compatibility: Yubico 5Ci provides the YubiKey 5Ci, on the one hand, with the functionality to support thousands of apps and protect their account credentials. With the Lightning connector, you can protect your iOS mobile apps and connect with a simple touch.
Dual connector: Yubico YubiKey 5Ci is an innovative multi-protocol hardware authenticator featuring a dual connector for lightning and USB-C ports.