Security keys to thwart hackers are now easier to use on all your devices - CNET
Yubico USB-C YubiKey 5C NFC Two-Factor Security Key
Yubico - YubiKey 5Ci - Two-Factor authentication Security Key for Android/PC/iPhone, Dual connectors for Lighting/USB-C - FIDO Certified : Electronics
Why both a YubiKey 5C NFC and a YubiKey 5C? : r/yubikey
Avada Tech Yubico YubiKey 5C NFC USB-C Security Key,WebAuthn, FIDO2 CTAP1, FIDO2 CTAP2, Universal 2nd Factor (U2F) - AliExpress
Yubico Security Key C NFC Review
Yubico YubiKey Bio Review
Yubico YubiKey 5C NFC - Two Factor Authentication USB and NFC Security Key, Fits USB-C Ports
Yubico 5C NFC Review - MacRumors
Physical Attributes — YubiKey Technical Manual documentation