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noise so that you can listen to your music or talk on the phone with
less interruption�
Controls
For an overview of product controls, see the Quick Start Guide
included in the packaging or reference the Online Manual at
ISOtunes.com/manuals
Power On/Off
Method 1
Power ON: Remove earbuds from charging case�
Power OFF: Place earbuds into charging case�
Method 2
Power ON: In OFF mode, press and hold multi-function button
(MFB) for 3 seconds�
Power OFF: In ON mode, press and hold MFB for 6 seconds�
Bluetooth
®
Pairing
After powering on, the earbuds will automatically enter Bluetooth
®
Pairing Mode. Look for quick red and blue flashes from the earbud
as a confirmation. Open the Bluetooth
®
settings on your device�
Search for “ISOtunes FREE 2�0”� Pair and connect� You will hear
“Bluetooth
®
Connected” once connected�
Charging
There are three batteries to charge:
1� Charging Case Battery
2� Left Earbud Battery
3� Right Earbud Battery
Charging the Case
Insert USB type C charging cable into the charging case� The
charging case battery indicator light will start flashing to indicate
charge level�
Charging the Earbuds
Place earbuds into the charging case� The earbuds’ red indicator
light should be solid red, indicating that the earbuds are charging�
Only charge your ISOtunes FREE 2�0 with a Maximum 5 Volt
charger� Using a charger higher than 5 Volts could be dangerous
and may damage your ISOtunes product� Be especially careful with
“quick charge” or “turbo charge” chargers, which often supply 9, 12,
or 15 Volts� Your ISOtunes FREE 2�0 cannot be charged at voltage
levels above 5 volts.
Noise Attenuation
This product has been tested to the European Safety Standard
EN 352-2:2020 and the ANSI S3�19-1974 standard for a hearing
protector, with a Single Number Rating (SNR) of 31 dB and a Noise
Reduction Rating (NRR) of 25 dB� Full testing details are available in
the Noise Attenuation section of this booklet�
ANSI S3.19-1974
American National Standards Institute
The level of noise entering a person’s ear, when ISOtunes® FREE
2�0 earbuds are worn as directed, is closely approximated by the
difference between the A-weighted environmental noise level and
the Noise Reduction Rating (NRR). Improper fit of this device will
reduce its effectiveness in attenuating noise. Consult the enclosed
instructions for proper fitting. ISOtunes FREE 2.0 should not be
used if a proper fit is not achieved or maintained.
A1:
Frequency (Hz)
A2:
Mean Attenuation (dB)
A3:
Standard Deviation (dB)
Example:
1� The surrounding noise level measured at the ear is 100 dB�
2� The NRR of ISOtunes® FREE 2�0 is 25 dB�
3� The noise level entering the ear is approximately equal to 75 dB�
