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I have used some in the past.
Basically the ear muffs have a built in microphone to enhance your hearing; but at the same time, there is a sensor that is extremely fast to shut the microphone off when a dangerous decibel level is detected (gun fire)
I wish i could afford a pair; they are awesome. And if the battery ever goes out, you still have the hearing protection, but not the sound enhancement.
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Krav Maga/Judo
Qualified Rifleman/Marksmanship Instructor/Lic. Medic
"There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the Spirit" Romans 8:1
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