Some products on our intercom table are headsets, and some are parts. The LEXIN 40mm audio kit is a part, and the distinction decides everything about it.
Inside the box sit two 40mm speakers, speaker pads, a boom mic, a button mic, and a boom mic holder. Everything connects over a Type-C cable to a LEXIN headset you already own. There is no battery, no radio, no pairing screen, and no rider count in anything LEXIN says about this kit.
Our table still files it as a two-rider intercom, which turns 35.99 into about 18 a rider for a product that carries zero riders. The row needs the same fix its 36mm sibling got, and I will come back to that.
The 40mm kit makes sense as a repair part or a second-helmet fit-out, and its owner record reads less like a review section and more like a maintenance log. That record is the honest part of this listing, and it is where the article spends its time.
A Type-C box with no electronics in it
The details table confirms the shape of the kit better than the marketing does. A Connectivity Technology row prints Wired.
The Built-In Media row lists exactly what I named above, and nothing else. One speaker pair, two microphones, pads, a holder.
The model number is A14S0103, and the warranty row is the generous one here: two years from the manufacturer, which is long coverage for a 35.99 accessory. LEXIN sells the same boom-and-button microphone pattern across its headset bundles, so the box exists to keep an existing headset alive, not to add anything to it.
Because the kit adds no electronics, it also adds no range, no riders, and no battery life. Every claim on the page that mentions sound quality is a claim about two small speakers and their fit inside your helmet's ear pockets.
The listing cannot agree on which headsets it fits
Fitment is where this page argues with itself, and the argument is not small.
The title and the first bullet name three headsets: the LEXIN G2, G2P, and G1.
The details table's Compatible Devices row names seven: B4FM, GTX, G2P, G16, G1, MTX, and Novus. The title's G2 does not appear in that row at all, and the row's B4FM, GTX, G16, MTX, and Novus never appear in the bullets. A Generation row on the same page says G2P, as if the kit belonged to one headset family.
Compare the 36mm audio kit, whose listing settles on the wider seven-headset list in both title and rows. The 40mm kit's own page cannot decide whether it serves three headsets or seven, and a buyer cannot resolve that from the listing either.
The practical advice is the same as for any LEXIN accessory: match the model number and the connector, not the marketing. The connection here is Type-C, which rules out older LEXIN units with different plugs, and the 40mm driver size rules out helmets whose ear pockets were cut for the smaller 36mm speakers. Check both before ordering, because the page will not check them for you.
The record reads like a wear ledger
Forty-five ratings back a 4.4 average, with a histogram that prints 70 percent five-star, 15 percent four-star, 7 percent three-star, 3 percent two-star, and 5 percent one-star. Eleven owner texts sit underneath, every one of them carrying the purchase badge, and they span from May 2024 to September 2026. Two years is long enough for a pattern to be a pattern, and the pattern here is wear.
The only text in the record that other owners voted on, two helpful votes, says it plainly. That owner states the speakers and microphones work great at first, and that after a few rides the wires break or the connections wear until the set stops working.
They go through two or three sets of speakers per riding season, wearing the helmet daily, and they still call it cheaper than a Cardo or Sena. That is not a defect report. That is the cost structure of the whole class, stated by the person best placed to know it.
The newest critical text makes the opposite point. One owner reports that the kit did not improve the poor quality of their G2P system, and totals the damage: two G2P units plus this kit came to about 200, after which they moved to a Sena 50S at 800 and now have a working intercom at highway speed.
An accessory cannot fix a host, and this buyer's ledger shows what happens when you try.
Around those two poles sit a one-line July 2026 one-star, a French one-star reporting no sound from the earphones, and a stack of short satisfied texts: fit perfect, works very well, arrived fast, works as should. One owner bought the kit to rig a second helmet for dirt riding and called it better than buying a whole new unit, which is the cleanest statement of what the box is for.
Spec rows for a product that has no radio
The details table files a fantasy product alongside the real one. A Bluetooth Version row prints 5.3 on a kit whose connectivity row says Wired. A Water Resistance Level row rates the water resistance of a set of passive speakers.
The weight row prints 2.46 ounces for two speakers, two microphones, pads, and a holder, which at least lands in the believable range, unlike some of the weight rows we have caught on this category.
The 40mm driver claim is the one figure worth taking seriously, and it cuts against the bullet's powerful bass promise.
Small drivers reproduce the highest audio frequencies, and deep bass needs large drivers and enclosure volume, per Wikipedia's loudspeaker article. A 40mm helmet speaker sits at the small end, so read the bass claims as marketing and judge the kit on clarity and fit, which is where its record actually scores.
The 36mm sibling's page carries the same template disease, an impedance row that argues with its own bullet and an Active Noise Cancellation row on a kit with no electronics. If you are choosing between the two sizes, the honest comparison is fit: 36mm for tighter ear pockets, 40mm for helmets with room, and the model list above for the plug.
Buy it to repair, not to upgrade
The decision this box forces is about what it cannot do. If your LEXIN headset's original speakers are worn flat, muffled by thick cheek pads, or dead at the connector, this kit is the cheap fix, and the two-year warranty row backs the purchase better than most accessories in the category.
If you are fitting a second helmet to one headset, the boom-and-button mic pair covers full-face and open-face shells in one order. That is the kit's whole point, and one owner's dirt-helmet rig shows it working.
If you are shopping for your first communication system, buy a headset instead. A rider starting from nothing needs the full LEXIN B4FM bundle, which carries the actual intercom, and anyone comparing complete units should work from our intercom comparison table rather than a row that prices speaker parts per rider.
Riders already deep in a G2P should read that Canada owner's ledger twice before spending another 35.99 on an accessory that cannot fix the host.
Frequently Asked Questions
Does this kit work without a LEXIN headset?
No. The speakers and microphones connect over Type-C to a LEXIN unit, and the details row lists B4FM, GTX, G2P, G16, G1, MTX, and Novus. It has no battery and no radio of its own.
Which headsets does it fit, the three in the title or the seven in the details row?
The listing does not settle it. Treat the details row as the wider claim, confirm your own unit's connector before ordering, and remember the title's G2 does not appear in that row.
How long do the speakers last?
The record's most-voted owner goes through two or three sets per riding season with daily wear, because wires break and connections wear. Budget for it as a consumable, not a one-time purchase.
Is this better than the 36mm kit?
They are different sizes for different helmets, not an upgrade path. The 40mm drivers need more room in the ear pockets, and both kits share the same boom-and-button mic approach and the same 35.99 price.