LG FR74 - Manual (Page 18)

Using the LG Heart Rate Earphones 18
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General Operation
Turn on
1. Press Menu button on the LG Heart Rate Earphones for 3 seconds to turn on the power.
2. The device is turned on, LED blinks violet with a beep sound.
And voice guide (earphones) informs you of remaining battery status.
Turn off
1. Press Menu button on the LG Heart Rate Earphones for about 5 seconds to turn off the power.
2. The device is turned off slowly, LED blinks in red with a beep sound.