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If you're not using hardware two-factor authentication (also known as multi-factor authentication or two-step verification), then you should. This combined USB-A and NFC security key replaces getting sent SMS messages by online services to authenticate that you, are indeed, you.
I keep a USB-A to USB-C adapter handy, so I can attach this to more modern devices. Since it has both USB-C and NFC, the key works with a whole host of devices, from iPhone to Android, to Windows and Mac systems.
This key can be used for hundreds of online services, from Facebook, Google, and Twitter to more specific services, such as Coinbase, Salesforce, and Login.gov. Your YubiKey can also be used to secure password storage services such as Bitwarden, Password Safe, and LastPass.
This is a tiny cable that has it all when it comes to connectors. While I don't rely on this for regular charging, it's the perfect backup cable for those times when I've misplaced the cable I need. It includes: