Reddit mentions of Feitian MultiPass K16 Security Key - FIDO U2F - Two Factor Authentication with USB-A, NFC, Bluetooth - Compatible with Windows, Linux, Mac OS with Chrome, Firefox, etc.

This is the advanced protection program (sorry for the shit links, on mobile):

https://landing.google.com/advancedprotection/

These are the keys needed to become part of the program:

Feitian MultiPass FIDO Security Key https://www.amazon.com/dp/B01LYV6TQM/ref=cm_sw_r_cp_api_9m5VBbECNKD8S

FIDO U2F Security Key, Thetis [Aluminum Folding Design] Universal Two Factor Authentication USB (Type A) for Extra Protection in Windows/Linux/Mac OS, Gmail, Facebook, Dropbox, SalesForce, GitHub https://www.amazon.com/dp/B06XHTKFH3/ref=cm_sw_r_cp_api_Gn5VBbR3QKQ5N

> Google Titan

They suck:

• The Titan hardware is the same as Feitian MultiPass K13 and Feitian ePass NFC bundle
  
  
• The rebranded MultiPass that they're selling sucks, it uses Micro USB which is a weak and outdated connector.
  
  
• The keys are made in China by a Chinese company. If you care about this, then you're better off with Yubico or some open source vendor. I don't have a problem with Feitian though, they've been in this business for a long time.
  
  
• The MultiPass key isn't waterproof and can be popped open. The non BLE versions are sealed using epoxy and really impossible to break, just like a YubiKey. I wouldn't trust a MultiPass key as a backup. See the Amazon reviews for yourself.
  
  
• There's lots of issues with BLE, OSes even had to block pairing with insecure security keys that Google/Feitian was forced to recall.
  
  
• It's another damn device that requires charging.
  
  
• Can only be used for Google Accounts on iOS with the Smart Lock app installed. While YubiKey has made active efforts to support the 5Ci on iOS.
  
  For $50-$70, I'd probably get one of these options as a backup:
  
  
• 50-70$ -1 x YubiKey 5 series, preferably the 5Ci or another 5 NFC.
  
• 60$ - 5 x Feitian HyperFIDO Mini, to hide them in bank lockers/backpacks
  
• 60$ - 3 x Yubico Security Key, because they support FIDO2 for Azure AD/Microsoft Acccounts
  
• 60$ - 1 x Feitian BioPass, since biometrics is more secure than typing a PIN on a software keypad. Wouldn't trust it in an airport though, legally a grey area.
  
  
  I also tried GoTrustID (paid) and Krypton which are app based U2F authenticators with push notifications for verification. They act as a decent wireless software backup that works for all accounts. GoTrustID is BLE based while Krypton uses push notifications.
  
  Google currently doesn't allow using an Android phone as a BLE security key except for Google accounts (uses a proprietary protocol called CaBLE that only works on Chrome Desktop right now).
  
  I've personally found USB-C to be the most robust method on Android phones and newer laptops, it's really quick and easy. Windows 10 doesn't even show me an option to pair a Bluetooth U2F authenticator on 1903, only Chromium browser has implemented it, not the OS itself. With the YubiKey 5Ci, it should be easy to authenticate on literally any device from the last 10 years with minimal dongles, so it will be my first choice as a backup. USB-C is better than NFC for me.

Could you please support not only Yubikey but also the Yubico security key, the Thetis key, and Feitian?