Will this work with Twitter, much like the Yubikey?

It should do - the ordinary Feitian key certainly does - but depending on your computer, you may have to connect it via USB anyway - I couldn't get my Mac to work with Bluetooth for U2F. The NFC mode will work on Android, as long as you have a recent phone. You can also use the key with Facebook and other sites. If it were me, I'd probably go with the Feitian ePass and not worry about Bluetooth. Or, if you use LastPass as your password manager, get a Yubikey NEO, as LastPass only supports Yubikey OTP, not U2F at the moment

Is this the T1 or T2 version of this product?

It doesn't have T1 or T 2 on it, it has a number 3 in a circle where you would expect T1 written near the mico-USB port

Does it work with iphone or i need some kind of adaptor?

Dear Madam/Sir, on IOS you need to use the free application SmartLock available on Apple store.

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Feitian Multipass FIDO U2F Security Key

Product ID: 50714675

Details

Brand
FeiTian
Colour
White
Connectivity technology
USB
Hardware interface
Bluetooth USB
Special feature
Rechargeable

🔋Rechargeable battery included

🔗3-in-1 USB, NFC & BLE connectivity

🛡️Phishing-proof site-specific keys

Description

🛡️ Lock down your digital life with the ultimate 3-in-1 security key!

TRUSTED EUROPEAN SUPPORT - Backed by reliable stock and customer service from France, ensuring peace of mind and swift assistance when you need it.
WIRELESS FREEDOM WITH POWER - Enjoy the convenience of wireless authentication without sacrificing security, powered by a rechargeable battery for on-the-go protection.
CROSS PLATFORM COMPATIBILITY - Supports Chrome OS, Windows, macOS, Linux, Android, and iOS, making it the ultimate security companion for every device you own.
UNBREAKABLE PHISHING DEFENSE - Site-specific keys ensure your secrets never leave your device—no phishing or man-in-the-middle attacks can breach your accounts.
SEAMLESS MULTI DEVICE SECURITY - Connect effortlessly via USB, NFC, or Bluetooth BLE for instant authentication across desktops, laptops, tablets, and smartphones.

The Feitian Multipass FIDO U2F Security Key is a compact, rechargeable authentication device that uses USB, NFC, and Bluetooth BLE to provide phishing-resistant, site-specific two-factor authentication across all major operating systems. Designed for professionals who demand seamless, wireless security on any device, it offers robust protection backed by European support.

Specifications

ASIN	B01LYV6TQM
Brand Name	FeiTian
Colour	White
Compatible Devices	Smartphone, Tablet
Customer Reviews	3.8 3.8 out of 5 stars (313)
Flash Memory Type	usb
Hardware Connectivity Technology	USB Type A
Hardware Interface	Bluetooth, USB
Item Weight	50 g
Manufacturer	Feitian Technologies
Manufacturer Part Number	MultiPass K16
Model Name	Multipass FIDO
Model Number	K16
Network Connectivity Technology	USB
Product Features	Rechargeable,Wireless

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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