What is two orange lights on lenovo think pad T420?

What is two orange lights on lenovo think pad T420? What is two orange lights on lenovo think pad T420

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An orange battery light means the battery is charging, but is low on power. If the battery light is blinking orange, the battery requires charging.

No hint of TWO orange lights, just one.

Nobody got it right. I worked for IBM and then Lenovo in Procurement Engineering mostly involved in Thinkpads. It looks like the Fingerprint Reader indicator lights.
That should be the UPEK Touchstrip TCRD4C - USB 147e:2016

Amber color is something wrong. Usually it would blink amber when the fingerprint could not be read. Could be the driver is not correct.
T420 user guide was here