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Google has confirmed the Pixel 4 smartphone's Face Unlock system can allow access to a person's device even if they have their eyes closed.

One security expert said it was a significant problem that could allow unauthorised access to the device. By comparison, Apple's Face ID system checks the user is "alert" and looking at the phone before unlocking. Google said in a statement: "Pixel 4 Face Unlock meets the security requirements as a strong biometric." Speaking before the launch, Pixel product manager Sherry Lin said: "There are actually only two face [authorisation] solutions that meet the bar for being super-secure. So, you know, for payments, that level - it's ours and Apple's."