It means it is receiving a signal. It is good to read the manual when you first get it, and then again after you have used it a few dozen times.
BaoFeng BF-888S
https://baofengtech.com > BF888s_Manual
PDF
BaoFeng BF-888S ... Lights red during transmit,
green when receiving a signal ... you that battery needs recharging. Alert tone will sound and Red LED will blink.
7 pages
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