LG FR74 - Manual (Page 17)

Starting the LG Heart Rate Earphones 17
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5. Secure the ear loop back over the ear.
6. Adjust the length of the cable using the Peg.
7. Clip the device on your belts, clothing or strap of bag.
Among three size of ear tips, select the ear tip that best fit your ear.
The measurement is reliable when you wear the ear set adhering it’s sensor to your ear.
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Note