Microphone jack light

[pavankoushik18]

There is red light glowing on my microphone jack. I never saw that before, please somebody explain.

lenovo y 50-70, i7, gtx860m 2gb, 8gb ram.

 

[kanewolf]

My guess is that the plug can be used as an optical audio output. See page 17 of https/download.lenovo.com/consumer/mobiles_pub/lenovo_y40-70_y40-80_y50-70_y50-80_y50-70%20touch_y50-80%20touch_ug_english.pdf It is an S/PDIF jack.