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Before using Nokia Pro Wireless Earphones, connect the 
Micro USB cable to a power source to being charging.
When battery is low, the earphones will beep and LED 
indicator light will flash red.
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Power on: Press and hold Key     for 3 seconds until the LED  
                   shows a white light.
Power off: Press and hold Key     for 5 seconds until the LED 
                   shows a red light.
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