The Allen Company ULTRX™ Bionic Electronic Earmuff (Model 4149, Interstate Yellow) provides active hearing protection and ambient sound enhancement for shooting sports. Operating on two AAA batteries, these electronic earmuffs feature dual high-gain omnidirectional stereo microphones tuned with Studio Harmonics to maintain directional hearing and range communication. When ambient sound or firearm discharge reaches or exceeds 82 dB, the dynamic wave compression technology reacts within 0.02 seconds (20 milliseconds) to suppress harmful impulse noise. Certified to ANSI S3.19 standards, the unit provides a 22 dB Noise Reduction Rating (NRR) in a slim-profile folding design equipped with a rubberized outer coating and a 3.5 mm auxiliary audio input jack for external devices.

Key Features

• Active Sound Compression: Compresses harmful impulse noise over 82 dB within 0.02 seconds (20 ms) while amplifying low-level ambient sounds.
• Dual Stereo Microphones: Built with two high-gain omnidirectional microphones featuring symmetrical response for natural sound reproduction.
• Acoustic Rating: Delivers ANSI S3.19 certified hearing protection rated at 22 dB NRR.
• Auxiliary Connectivity: Includes an onboard 3.5 mm AUX input jack for wired audio devices and two-way communications.
• Low-Profile Build: Features a folding design with a rubberized protective outer finish, pillow-foam earcups, and a padded headband.
• Battery Powered: Operates entirely on 2 standard AAA batteries without requiring mains power or AC charging docks.

Specifications

• Model Number: 4149 / AL4149
• Colour: Interstate Yellow
• Noise Reduction Rating (NRR): 22 dB (ANSI S3.19 certified)
• Compression Threshold: Activates at or above 82 dB
• Reaction Time: 0.02 seconds (20 milliseconds)
• Microphones: 2 high-gain omnidirectional stereo microphones
• Audio Input: 3.5 mm auxiliary (AUX) jack
• Power Supply: 2 × AAA batteries (not included)
• Form Factor: Over-the-head slim-profile folding cup design

Who is the Allen Ultrx Bionic Electronic Ear Muffs Yellow 22nrr for?

• Outdoor Target Shooters — Provides an ANSI S3.19 certified 22 dB NRR combined with a 0.02-second compression reaction time that actively suppresses rifle and shotgun muzzle blasts while keeping range commands audible through dual stereo microphones.
• Clay Target Discipline Participants — Uses dynamic sound compression that engages instantly at the 82 dB threshold within 20 milliseconds, safeguarding hearing during high-frequency shotgun firing without blocking squad communication.
• Hunters Needing Situational Awareness — Features dual omnidirectional microphones that amplify low-level ambient environmental sounds until gunfire reaches the 82 dB compression limit, protecting hearing while preserving acoustic tracking in the field.

Less suitable for: Indoor shooting ranges or unsuppressed magnum centerfire rifle shooting producing impulse noise peaks of 160 dB or greater without doubling up; these environments require high-attenuation passive or electronic earmuffs rated at 26 dB to 31 dB NRR or the addition of inner foam earplugs.