The YubiKey 5C is what one would likely consider a mini-sized key; the USB-C connector helps with the ability to shrink the footprint. With an injection molded semi-gloss black body, it has a small but slightly hard to notice LED light on the corner by the keychain hole. The capacitive touch sensors are located on the sides of the body. The key feels high-quality, is light in weight, and fits onto a keychain without issue.
With only a $5 USD difference, the real tradeoff of the key compared to it's bigger sibling is NFC support vs size. As with most Yubico keys, the cost is on the higher end.
Available Features And Management
Just like its siblings in the YubiKey 5 range, the 5 Nano offers FIDO2 as well as FIDO U2F, HOTP, TOTP, smartcard, OpenPGP, and secure static password – some of those features requiring the associated YubiKey Manager software to leverage.
FIPS 140 Availability
Yubico produces a FIPS 140 variation of this key.
Enrollment And Usage
The key enrolled in Azure AD without issue.
The key worked consistently after enrollment without issue.
The key was factory reset without issue.