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Noise Attenuation
APPROVAL: ISOtunes ™ is tested and approved in accordance with ANSI S3.19-1974
Specifications.
The level of noise entering a person’s ear, when
ISOtunes
™ headphones
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.
Example:
1. The surrounding noise level measured at the ear is 100 dB.
2. The NRR of ISOtunes ™ is 26 dB.
3. The noise level entering the ear is approximately equal to 74 dB.
Please note that the NRR is based on the attenuation of continuous noise and may not be
an accurate indicator of the protection attainable against impulsive noise, such as gunfire.
Shift Between Calls on Two Devices
While on a call with phone A, you can answer a call from phone B by
pressing the MFB once. This will put the call from phone A on hold. Press
the MFB again to shift back to the original call.
While on a call with phone A, you can end the call and answer a call with
phone B by pressing and holding the MFB for 2 seconds.
SafeSound
™
Technology
If your device incorporates SafeSound
™
Technology, its volume output has
been limited to 85 decibels. 85 decibels is the maximum volume limit allowed
by OSHA in the workplace over an 8 hour period.
ISOtunes
™
devices with
SafeSound
™
Technology are OSHA, NIOSH, and ANSI compliant.
Frequency, Hz 125 250 500 1000 2000 3150 4000 6300 8000 NRR
Grand Mean Attenuation, dB 28.5 25.4 30.3 32.8 37.7 42.0 40.9 44.0 44.6
Standard Deviation, dB 2.8 2.3 3.0 3.8 2.8 3.3 3.6 2.7 3.4
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