Active Noise Cancellation (ANR), Adjustable Headband, Ambient Sound Enhancement, Gel Padded Ear Cushions, Batteries Not Included. AAA(Batteries not included). The built-in chip is upgraded to DSP digital signal chip, which makes your call communication more stable. The headset includes two frequency modes, which can be freely switched between indoor and outdoor noisy environments in different conditions, controlled by soft-touch digital buttons. The voice enhancement function can find voice in background noise and actively filter the noise to improve voice clarity and make the call more comfortable. Protect your ears at the shooting range or while hunting with these electronic ear muffs; these ear muffs are guaranteed to provide maximum protection and won’t be loud enough to interfere with the gun rack. New battery cover, with snap-on battery cover to prevent accidental touching, easy to install the battery and simple to operate. The rear headband version of the headset has a thin and lightweight design and can be worn under a helmet or hat, giving you more wearing options.