The YubiKey 5Ci combines hardware-based authentication and public key cryptography to eliminate account takeovers. The YubiKey 5Ci offers a unified secure authentication solution for modern devices. Simply insert either connector to the device of your choice and experience YubiKey authentication that's four times faster than typing in a One Time Passcode. Register only once on the device and get recognized on any other device of your choice. And no battery or network connectivity required, so the YubiKey 5Ci is always on and accessible for authentication. The YubiKey 5Ci also delivers secure login to macOS, Android, Windows, ChromeOS and much more. -Secure your login and protect your account with hundreds of services like LastPass, Dashlane, 1Password and others. -Protect your online accounts from phishing and account takeovers. A YubiKey makes it extremely difficult to gain access or steal your most important files, pictures, emails, and financial information. -Register easily with hundreds of services. Once registered, each service will simply request you to insert and tap your YubiKey to gain access during login. Simple, convenient, and secure. -Use the same asymmetric cryptography and strong security used by individuals at 9 of the top 10 technology companies. Yubico pioneered the creation of the FIDO U2F and FIDO2 authentication protocols along with Google and Microsoft. Using the YubiKey, companies have seen zero successful phishing attempts. The YubiKey 5Ci is FIDO and FIDO2 certified. It works with Google Chrome or any FIDO-compliant application on Windows, macOS or Linux and with applications that provide FIDO, FIDO2, or one-time-password (OTP) support and through Chrome, Firefox, or Edge browsers.