Microsoft uses strong, easy-to-use 2FA credentials to align with the mission to exchange passwords and the FIDO Alliance.  FIDO2's CTAP specification includes several optional features and enhancements that are essential for providing a seamless and secure experience.  The security key must implement the following features and enhancements from the FIDO2 CTAP protocol for compatibility with Microsoft.

USB Specification
Product Specification

Items Description
Protocols FIDO 2.0 (including resident key, Bio-API, credential management)
FIDO1.2 U2F,  OATH  HOTP/TOTP
Resident Key  (credential_ID, private key, Rp_ID) are stored in ThinC. This feature makes the security key portable and the credentials are stored in the security key.
Attestation Key PKI key generated during manufacture is stored to sign on public key to be sent to Rp server.
hmac-secret With this extension, you can sign in to your device when you are offline or in airplane mode. 
Multiple accounts This feature allows you to use the same security key across multiple services such as Microsoft Account (MSA) and Azure Active Directory (AAD).
Client PIN This feature allows you to protect credentials with a second element and apply them to security keys that do not have a user interface.
PKI Cryptography AES 256, DES/TDES, RSA, DSA, ECC, ECDH, RNG, SHA256/SHA512
Secure Element cryptographic acceleration
Encrypted storage for biometric templates
Dynamic on-chip encryption/token key generation
FIPS 140-2 Level2 standards
Fingerprint False Accept Rate   <0.001%
False Reject Rate   <1%
Recognition Time <0.6s (for 120 finger points)
Acquisition Time   <180ms
Physical Quantity Size        5.6 x 2.1 x 0.8 cm / 2.20 x 0.83 x 0.31 in
Weight  9.07g / 0.02 lb
FP setting software  Set up soft "ThinC-AUTH" run on Windows 7 and Mac OS 10.12 or above

Electrical Characteristics

Items Description
Working Voltage 5.0V
Working Current Standby: 80 mA
Power Standby: 0.4W
Working Temperature -10°C to 45°C
Storage Temperature -20°C to 70°C
LED Lights 2 multi-color LEDs
Casing Material Metal+ABS
Interface USB-A

Sensor Characteristics

Items Description
Image Pixel 160 x 160 pixels with 8-bit depth
Resolution 508 dpi
Power Ultra Low Power
Type Capacitive 360° Touch
Image Quality Superior 3D image
LED Lights 2 multi-color LEDs
Durability More than 200k times hits
Power 5 fingerprint templates
ESD ±30 kV

Industrial Standards

Organization Standards
FIDO Alliance FIDO certified product
Microsoft Corporation Microsoft certified product
US Federal Information Processing Standard FIPS 140-2 level 2 standards
European Union (EU) ROHS  Hazardous Substances standards
European Commission (EC) EN55032:2015(Class B)
EN55024:2015
EN61000-4-2:2009 (contact level 2 (+-4kV), air:level 3 (+-8kV))
EN61000-4-3:2006+A2:2010 (contact level 2 (+-4kV), air:level 3 (+-8kV))
EN61000-4-8:2010 (level 2 (3A/m), continuous field)
Federal Communication Commission (FCC) FCC Part15 subport B:2018 (Class B)

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