Windows Hello is a more personal way to sign in to devices running Windows 10. It recognizes your eyes to verify your identity, which means you get enterprise-grade security without having to type in a password.
The Lumia 950 and 950 XL are ready to use Windows Hello now, and more devices supporting Windows Hello will be available in the future.
On Start , swipe over to the All apps list, and then select Settings > Accounts > Sign-in options to set up Windows Hello. (If you don't see a sign-in option for Windows Hello, then your phone doesn't support it.) Once you’re set up, you’ll be able to unlock your phone at a glance.
You might be asked to add a PIN before you can set up Windows Hello.