1Key is a passwordless, biometric authentication device that provides a physical token supporting unlimited users with a register-once, use anywhere approach. The device is FIDO-compliant and functions as a biometric security key. It supports up to 10 fingerprint scans per individual user and provides phishing-resistant passwordless multi-factor authentication without requiring individual physical keys for each user. The device is compatible with Windows login and WebAuthn services and applications. It remains plugged into protected endpoints at all times and can verify fingerprints for multiple users. The device is FIDO2 passkey and CTAP2 compliant for interoperability across various systems. 1Key addresses authentication challenges in restricted environments where mobile phones and camera-equipped devices are prohibited, such as call centers, manufacturing floors, clean rooms, SCIFs, and healthcare facilities. It delivers biometric authentication for shared workstations and multiple kiosk systems providing security, accountability, and auditability in settings where multiple users access shared accounts.