You can unlock the iPhone X Face ID - but it takes some work

The new facial-recognition technology replaces the fingerprint sensor

Apple is offering a nifty way to unlock its new iPhone X - just stare at it.

The new facial-recognition technology replaces the fingerprint sensor found on other models.

Many rival Android phones already use facial-recognition technology. Samsung also has an unlock feature that scans your iris. But the systems can be tripped with something as simple as eyeglasses.

Apple's Face ID works even with glasses or a hat, and in the dark, though an Associated Press review finds some challenges with masks and major facial changes.

Face ID is one of the features exclusive to the iPhone X, which comes out Friday for $1,000 - $300 more than the iPhone 8 

Besides unlocking the phone, you can use Face ID to confirm app purchases and log into banking apps.