Earmor M31 Plus Electronic Ear Muffs — Tactical Headset, NRR 22
$69.99
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EDITORIAL REVIEW: 4.4/5 — WC Safety Review of the earmor m31, the tactical-headset take on electronic hearing protection. Editorial assessment by Steven Eaton, WC Safety editor, based on published Earmor specificati...
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EDITORIAL REVIEW: 4.4/5 — WC Safety Review of the earmor m31, the tactical-headset take on electronic hearing protection.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Earmor specifications and category fit. We did not laboratory-test this product.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Earmor specifications and category fit. We did not laboratory-test this product.
The Earmor M31 arrives at the range from a different direction than its American rivals: OPSMEN builds tactical headsets, and it shows — gel ear pads where the category ships foam, a connectorized build, and up to 5X ambient amplification behind an NRR 22 shell with compression above roughly 82 dB. The M31 Plus build documented here is the middle of the Earmor trio.
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Why the Earmor M31 stands out in the electronic tier
Most range muffs are built down to a price; tactical headsets are built up to a spec, and the M31 inherits the second tradition at the first tradition's price point. Gel pads seal around eyewear temples where foam gaps, the connectorized build hints at the comms platform it shares DNA with, and the 5X amplification ceiling out-hears most of the tier. Our full M31 review rates it 4.4/5; the best electronic shooting muffs guide ranks it against the field.
Safety first: NRR 22 is the shell's passive laboratory rating — real-world attenuation runs lower, and amplification adds awareness, not rated decibels. High gain is a tool, not a toy: run it at the minimum that restores awareness. Dead batteries fail safe to passive protection, but quiet muffs get pulled off — carry spares. Indoor ranges and magnum calibers push impulse peaks toward the top of the 140–165 dB band; run foam plugs underneath there. For workplace use, apply your program's derating per the OSHA 1910.95 hearing conservation guide.
What the listing documents
From the published specs: an electronic hearing protector rated NRR 22 dB; up to 5X sound amplification; automatic compression of impulse noise above ~82 dB against gunshot peaks of ~140–165 dB; gel ear pads; a connectorized tactical-headset build — the Earmor M31 Plus generation. As m31 electronic ear protection it targets shooters first; the opsmen earmor brand behind it builds the tactical comms gear the design language comes from. The Razor Slim review covers the benchmark it undercuts on pads, and the four-mic Quad BT is the directional alternative.
Where the M31 sits in the Earmor trio
Earmor splits the line by format and capability: the M20 moves the electronics in-ear, this M31 is the core listen-only muff, and the M32 adds a communications microphone for radio integration. Reviews of the M20 and M32 map the ladder; cross-brand, the Walker's Razor Slim is the American benchmark and the Caldwell E-Max Pro the refined value play.
Electronic shell, passive math
Compression handles impulses; sustained noise rides the passive NRR 22, so run the standard numbers — the NRR explained guide covers derating and the calculation walkthrough applies it to your exposure. All-day steady noise beyond the envelope belongs to high-NRR passive muffs from the passive muffs guide; electronic vs passive draws the boundary and the when-do-you-need-hearing-protection pillar maps the thresholds.
Ownership: pads, batteries, and crew orders
Gel pads outlast foam but still age — replace them when they stiffen or tear, since the seal carries the rating — and keep spare batteries in the range bag. Indoor and magnum sessions pair with foam plugs from the hearing protection collection; ear plugs vs ear muffs explains the doubling logic, and the best hearing protection overview compares every format. For range or crew orders, quantity purchasing runs through a free Amazon Business account — volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations, with the walkthrough linked in our footer.
What the electronics do — and what still protects you
A level-dependent electronic muff protects passively. The cup, seal and foam do the attenuating, and that is what the NRR on the box measures — a figure required by the EPA under 40 CFR Part 211, Subpart B and tested to ANSI S3.19. The electronics do not add protection. They amplify quiet sound so you can hold a conversation or hear a machine change note, and compress or cut anything above roughly 82 dB.
The practical consequence is the reassuring one: if the batteries die, the muff still protects at its rated NRR. You lose situational awareness, not attenuation. The reverse error is the dangerous one — turning the volume up to hear better does not reduce what reaches your ear from the impulse noise the muff is compressing.
Derate the rating like any other. OSHA 1910.95 Appendix B subtracts 7 to convert for A-weighted measurement and OSHA separately recommends a 50% safety factor; at or above an eight-hour TWA of 85 dBA the employer owes a full hearing conservation program, not just a rated product.
Frequently asked questions
What is the Earmor M31?
An electronic hearing protector from OPSMEN's Earmor tactical line, rated NRR 22 and documented here in the M31 Plus build: up to 5X ambient sound amplification, automatic impulse compression above roughly 82 dB, gel ear pads, and a connectorized design.
What does 5X sound amplification mean?
The microphones can boost quiet ambient sound - voices, movement, range commands - to five times the natural level, which is the tactical-headset heritage showing. Run the gain at the minimum that gives you awareness; more gain buys noise, not protection.
How does the impulse compression work?
External mics pass sound through at safe levels until it crosses roughly 82 dB - then the circuit clamps instantly and the shell's passive attenuation absorbs the gunshot peak (roughly 140-165 dB), passing only the residual.
What does NRR 22 mean on this muff?
It's the passive rating of the shell with electronics off - amplification adds awareness, not rated decibels. Dead batteries fail safe to a passive NRR 22 muff; run your protection math on 22.
Why gel ear pads?
Long-session comfort and a better seal: gel conforms around eyewear temples and cheekbones where foam leaves gaps, which matters doubly because the seal carries the rating. It's a premium feature at a mid-tier price.
What does connectorized mean?
The M31 line's builds support wired connectivity per the listing - the tactical-headset DNA that separates Earmor from range-only brands. Check the current Amazon listing for the connector details of the shipping build.
M31 or the Earmor M32?
The M32 adds a communications microphone to the same platform - it's the choice when you need to talk on a radio or comms system. The M31 is the listen-only version and costs less.
M31 or the Earmor M20?
Format first: the M20 is Earmor's in-ear electronic protection, while the M31 is the over-ear muff. Muffs are more forgiving of fit and easier to share; in-ear wins under helmets and against rifle stocks.
How does it compare to the Walkers Razor Slim?
Same category, different heritage: the Razor Slim comes from the American range market, the M31 from tactical headsets - gel pads and connectorized builds versus the Razor's slim-cup simplicity. NRR is close (22 vs 23); fit and feature taste decide.
Is it good for shooting ranges?
That's its market: amplification passes range commands, compression clamps the shots, and the low-profile tactical cups clear a rifle stock. Indoor ranges and magnum calibers warrant foam plugs underneath.
Can it serve industrial work?
The listing includes industrial workers - impulse-heavy trades get awareness plus suppression. Confirm NRR 22 clears your program's derated exposure math; sustained loud environments may need more passive attenuation.
How do I order for a range or crew?
Quantity purchasing runs through a free Amazon Business account - volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations. The bulk-ordering walkthrough is linked in our site footer.
Brand / Vendor
OPSMEN
Model / SKU
—
Product Type
Ear Muffs
Price
$69.99 (Amazon)
Availability
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