U Fly Quiet UFQ-A6 Manual - page 4
Manual is about: Aviation Headset
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Understanding Controls for UFQ-6A
A. Clip which is easy on the Shirt or coat
B. Charge Port
C. Power ON/OFF switch
D. Power indicator LED
1) Power on LED shows blue color
2) In charging LED shows red color
3) If power on LED shows nothing means the battery runs out
then need to recharge the battery
4) While during use the blue color LED turn off also means the
battery runs out, then ANR is not available,need to switch to OFF