LG FR74 Owner's Manual page 12

12 Starting the LG Heart Rate Earphones
Wearing the LG Heart Rate Earphones
1. Connect Ear set to Main set.
2
2. Wear the Ear set with the Ear tip toward the ear canal.
3. Make the sensor pressed against your ear as shown illustrated.
4. Fasten the Shark Fin part to inside of ear as shown illustrated.