There is an under-display optical fingerprint reader around the bottom of the K20's screen. Those type of sensors have come a long way since their launch, and the one on the K20 Pro is as fast as any conventional fingerprint reader. The moment you touch the glass, the sensor lights up and unlocks the screen as soon as it has recognized your finger. It is very accurate and blazing-fast, and smudges didn't seem to slow it by much.
The pop-up module is containing the 20MP selfie snapper is on top of the K20 Pro. It is quite interesting for two reasons - the whole thing lights up in red while popping up and looks very cool. Unfortunately, having this LED only as decoraction seems like a missed opportunity of implementing an LED selfie flash.
The second reason we were quite intrigued by the motorized pop-up is that it contains the LED notification light. It's a small circle on top of the module and it flashes in red for missed notifications. This sure isn't the best spot, but unique it is.
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