The Caldwell E-Max Low Profile Behind the Neck Hearing Protection muffs feature an atypical design that allows for much more clearance for a shooter to mount a shotgun comb or other firearm without bumping into their ear protection. The Caldwell E-Max Low Profile Behind the Neck Hearing Protection muffs also feature integrated microphones and circuitry that amplify range commands while working to reduce damaging noises, enabling shooters to be situationally aware while protecting their ears. Decibel reduction rating: 21 Volume can be adjusted up to 20 decibels of amplification Noises greater than 85 decibels cut out to protect shooter's hearing The Caldw Mfg: Caldwell Shooting Supplies