Can I use it if I purchase a USB-C adapter ? And it will still work?

It would probably work, but they also sell them that have USB-C connectors, so I would just by one of those instead.

There is another one on here for $50. Yubikey5 , besides this being 50% cheaper , are these the same keys?

No. The YubiKey 5 has more functionality than the Security Key. The Security Key only supports FIDO U2F / FIDO 2. The YubiKey supports much wider range of authentication methods, but if you only need the ones supported by this key then you can save a lot instead of buying YubiKey 5.

Does this plug into a regular USB port?

It only fill 1/2 the USB slot, but it works as advertised.

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Yubico - Security Key NFC - Basic Compatibility - Multi-factor authentication (MFA) Security Key, Connect via USB-A or NFC, FIDO Certified

Yubico - Security Key NFC - Basic Compatibility - Multi-factor authentication (MFA) Security Key, Connect via USB-A or NFC, FIDO Certified

Product ID: 518466069

Secure Transaction

Details

Brand
Yubico
Hardware Interface
USB
Special Feature
Durable
Connectivity Technology
USB
Color
black

💧Water & crush resistant durability

🔌USB-A & NFC dual connectivity

🔐FIDO2 & U2F protocols

Description

🔐 Unlock effortless, bulletproof security—because your digital life deserves the best.

BUILT TO LAST - Rugged design resists water, crushing, and tampering for nonstop protection.
PLUG TAP CONVENIENCE - Authenticate instantly via USB-A or NFC—no batteries needed.
CROSS PLATFORM CHAMPION - Works flawlessly with Windows, macOS, Linux, ChromeOS & major services.
PASSWORDLESS POWERHOUSE - Seamlessly supports FIDO2 & U2F for next-gen MFA security.
AFFORDABLE SECURITY UPGRADE - Elite MFA protection without breaking the bank—perfect for professionals.

The YubicoSecurity Key NFC is a compact, FIDO-certified MFA device supporting passwordless and second-factor authentication via FIDO2 and U2F protocols. Compatible with major OS platforms and services, it connects through USB-A or NFC, requires no batteries, and offers durable, tamper-resistant protection. Designed as an affordable, reliable security solution for professionals seeking streamlined, cutting-edge authentication.

Specifications

Model Name	Security Key
Product Dimensions	3.94"D x 3.94"W x 3.94"H
Flash Memory Type	USB
Manufacturer	Yubico
Hardware Connectivity Technology	USB Type A
Hard Disk Size	16 GB
Global Trade Identification Number	05060408465295
Compatible Phone Models	NFC Enabled Devices
Hard Drive	16 GB Portable
Item model number	5060408465295
Hardware Platform	Mobile, Laptop, Desktop, Windows, macOS, ChromeOS, Linux
Item Weight	0.353 ounces
Item Dimensions LxWxH	3.35 x 2.17 x 0.04 inches
Hard Drive Interface	USB 1.1
ASIN	B0BVNPWPCN
Date First Available	January 24, 2023