Iris scanner technology is emerging in smartphones, including the new Samsung Note 7, but is expected to come soon to cars and ATM machines to verify a user’s identity.

Experts say an iris scan can be more reliable than a fingerprint scan, which is a big reason it is expected to be used in more devices in coming years. Each iris, the colorful part of the eye that forms a ring around the pupil, is unique and therefore a good biometric indicator.

Samsung’s Android 6-based Note 7, which shipped on Aug. 19, takes advantage of the technology as well as the Windows 10 Mobile-based HP Elite X3.

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