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info Edifier
Status Blue LED on for 3s
Indicates charging or low battery level.
? What Causes This
Battery needs to be charged or current battery status is low.
ⓘ What This Means
Plug in the charger and wait until LED turns green (fully charged).
Source: page 2 of the official manual
From the manual
This error code appears in:
Edifier WH950NB Bk Wireless Noise Cancellation Over Ear Headphones