CTA Electronic Earmuff

At California Tactical Academy, we are shooting experts. We have designed an electronic earmuff that lives up to our high shooting standards. We train shooters from all over the world and when it comes to your hearing, we don't want to take any chances. 

 

Electronic Shooting Earmuff

USER INSTRUCTIONS

The Earmuff amplifies surrounding sounds such as voices, machines and warning signals to safe levels yet it provides good hearing protection. Loud impulse sounds are effectively blocked out and limited to safe levels. This earmuff is provided with electronic audio jack input for connection with MP3 players, cell phones and radio scanners.

 

INSTRUCTION FOR FITTING:

According to instruction:

Open the battery lid by pushing the lid up with your thumbs. Let it slide off the ear cup.

Insert the two 1.5V AAA batteries ( Not Included ). Make sure that the “+” and “-” poles are in the correct position.

Ensure that the battery lid is closed completely.

1. Extend the headband before use.
2. Place the earcups over the outer ear, ON/OFF wheel on the right side.
3. Adjust the headband by moving it up and down in the side headbands. The ear cushions should seal firmly against the head.

For best results, remove all hair under the cushion. Noise reduction will be adversely affected by anything that impairs the seal of the earmuff cushions against the head, such as thick spectacle frames, hats, etc

 

Auto shut-off function 4 hours:

After automatic shut-off, wait 5 seconds.Turn earmuff on again to another 4 hours of working time.

 

Battery Replacement:

Open the battery lid by pushing the battery lid, then slide upward with your thumbs. Remove the old batteries. Insert two new 1.5v AAA alkaline batteries into battery compartment. Ensure the battery lid is closed completely. Warning-performance may deteriorate with battery usage.Change the batteries whenever the sound reproduction is weakened or impaired. New alkaline batteries provide approximately 350 hours for operation.

 

APPROVEL:Tested

NRR 22DB
Frequency（Hz）	125	250	500	1000	2000	3150	4000	6300	8000
Mean Attenuation(dB)	15.1	15.7	22.2	29.4	34.1	38.7	41.3	41.3	41.0
Standard Deviation(dB）	3.2	2.8	1.8	2.5	3.0	3.3	3.1	2.9	3.2

Example:

1. The environment noise level as measured at the ear is 92DB(A).
2. The NRR is 22DB(A).
3. The level of noise entering the ear is approximately equal to 70DB(A).

Caution: For the noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level should be used. Hearing protector must be worn at all times in noisy surroundings for proper protection.

Although hearing protectors can be recommended for protection against the harmful effects of impulsive noise, the noise reduction rating(NRR) is based on the attenuation of continuous noise and may not be no accurate indicator of the protection attainable against impulsive noise such as gunfire.

Constant or repetitive exposure to impulsive noise may lead to serious injury. Earmuff must be properly fitted to attenuate noise effectively. Refer to instructions.