How to tell when the battery is low. - Headphones/Earbuds

When the battery level is low during use of the unit, the blue blinking LED on the remote controller will change to red. A beep will sound every 1 minute. When the battery runs out, the power will turn off.  

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This FAQ applies to models RP-BTS10, RP-HF400B, RP-HJE120, RP-BTS35.