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EE2951 electronic sound block earmuff

Name:  Electronic sound block earmuff 

Model: EE2951
* Noise reduction rate 20 decibel-NRR20
* Cut off immediately when sound over 82dB
* One microphone

* One volume control
* Amplification 4 times to detect the ambient sounds
* Adjustable headband fits for all sizes
* Fold and compact away
* Lower pressure with light weight
* Soft padded ear cushion, wear comfortable
* Powered by 2x 1.5v AAA batteries

Attenuation Data:

Frequency(Hz)

125

250

500

1000

2000

3150

4000

6300

8000

NRR

Mean Attenuation(dB)

1.0

15.0

21.0

25

33.0

33.0

30.0

35.0

38.0

 

Standard Deviation(dB)

4.7

3.3

2.9

3.8

..4.2

2.8

2.8

3.5

3.6

20