Allen Bionic Features The Allen Bionic Electronic Earmuff is built around a dynamic wave compression system paired with a symmetrical microphone response which keeps communication clear even as the muff manages incoming sound. Two hi-gain stereo microphones amplify ambient noise for better awareness of surroundings and those same microphones shut down automatically within 0.02 seconds once sound reaches 82dB keeping the ANSI S3.19 certified NRR 22dB rating intact in genuinely loud environments. Studio Harmonics technology is used to shape the amplified audio aiming for clarity closer to a studio-grade system than a typical earmuff. An Aux Port accessory function rounds out the electronics giving the wearer the option to connect an external audio device when extra flexibility is wanted. Comfort and durability are handled through an extra-padded headband and cushioned pillow foam ear cups which make the Bionic suited to long sessions at the range or extended hours in the field. The exterior is rubberized for added strength helping the earmuff hold up to repeated use outdoors. Power comes from two AAA batteries which are not included giving up to 16 hours of runtime per the manufacturer before a change is needed. Finished in Veil Tac Gray Camo the Allen Bionic Electronic Earmuff is a practical choice for shooters who want dependable hearing protection without sacrificing the ability to hear what is happening around them. Allen Bionic Specifications Manufacturer: Allen Model: Bionic Type: Electronic Earmuff Color: Veil Tac Gray Camo NRR: 22 dB Style: Over the Head Battery Size: AAA Battery Life: Up to 16 hrs Certification: ANSI S3.19 Available At: GrabAGun