Product	K9+	K40+	A4B	K10	K28	K39
USB-A	●	-	●	●	-	-
USB-C	-	●	-	-	●	●
NFC	●	●	●	●	●	●
BLE	-	-	-	-	-	-
Biometric	-	-	-	-	-	-
FIDO2	●	●	●	●	●	●
FIDO U2F	●	●	●	●	●	●
OATH HOTP	●	●	●	●	●	●
OATH HOTP/TOTP	●	●	-	-	-	-
Static Password/ Challenge Response	●	●	-	-	-	-
NDEF (HOTP)	●	●	-	-	-	-
Preload Seeds	●	●	●	●	●	●
Smart Card (PIV)	●	●	-	-	-	○
Open PGP	●	●	-	-	-	-
Other Function	○	○	○	○	○	○