Basics7Device layoutEarbudMicrophoneHeart rate sensorCharging contactsEarbud tipWingtipMicrophoneTouchpadCharging caseMultipurpose jackCharging contacts(right)Charging case coverCharging case indicator lightCover open buttonCharging contacts(left)Earbud indicator light(right)Earbud indicator light(left)If there is sweat or liquid on the charging contacts, corrosion may occur on theearbuds. Clean the charging contacts and earbuds before storing the earbuds in thecharging case.