LEGALITIES
Fitting
R
FIG 2
FIG 1
ANSI S3.19-1974 Table (NRR Table)
EN 352-2:2002 Table (SNR Table)
Models
IT-40
Important
Please read, understand, and follow all safety information.
Fitting
1. Pull the earcups apart (Fig. 1)
2. Check for R and L indicators (Fig. 2)
3. Place the product on your head with the corresponding R and
L sides (Fig. 3)
4. Adjust the earcup position by extending the headband to
ensure a good fit around the ears
Introduction
Thank you for purchasing ISOtunes
professional noise-isolating headphones. These headphones
FIG 3
B5:
SNR: 27 dB
H= 29 dB
M= 24 dB
L= 19 dB
APVf=MF-SF9 (dB)
Sport DEFY Slim Basic
®
have been specifically designed for use in noisy environments
– allowing you to block out much of the surrounding noise so
that you can listen to your music or talk on the phone with less
interruption.
Powering On/Off
To power on, turn the Power/Tactical Sound Control™ Dial up (you
will hear and feel a physical click). To power off, turn the Power/
Tactical Sound Control Dial all the way down (you will hear and
feel a physical click).
Powering
The DEFY Slim Basic operates using two standard AAA batteries
(included). If you experience any issues, try removing the batteries
and inserting new ones.
Noise Attenuation
This product has been tested to the European Safety Standard
EN352-1:2002 and the ANSI S3.19-1974 standard for a hearing
protector, with a Single Number Rating (SNR) of 27 dB and a Noise
Reduction Rating (NRR) of 21 dB. Full testing details are available
in the Noise Attenuation section of this booklet.
ANSI
S3.19-1974
The level of noise entering a person's ear, when ISOtunes®
Sport DEFY Slim Basic 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.
A1: Frequency (Hz)
A2: Mean Attenuation (dB)
A3: Standard Deviation (dB)
Example:
EN | 8