The HyperFIDO USB-C Security Key is a hardware security key from Hypersecu that enables FIDO-based authentication via a USB-C interface. The product page specifically documents the use of a USB Type-A to USB-C adapter, which allows standard HyperFIDO security keys to be connected to devices with USB-C ports, including compatible Android mobile devices. Key usage notes: - The security key must first be registered on a PC before it can be used on a mobile device. - The adapter connects the HyperFIDO key's USB Type-A interface to a USB-C port. - The mobile device must support USB OTG (On-The-Go) to read the security key. - Authentication is triggered by pressing a physical button on the key when the LED indicator begins flashing. - Once a Google Account is added on a mobile device using the security key, repeated key-based sign-ins are not required unless the account is removed or security settings are changed. The page provides step-by-step instructions for signing into a Google Account on an Android device using the HyperFIDO key via the USB-C adapter.