A range quoted in open ground, between two units · review
An intercom published for up to 10 riders at 2000 m, using DSP and CVC noise reduction the maker states cuts wind and engine noise by over 90%, with an 800 mAh battery giving 15 hours.
The bottom line Publishes seven separate figures where its neighbours publish two. The 90% noise claim is the one number here without a condition attached.
Up to 10 riders at 2000 m. DSP and CVC noise reduction, stated to cut wind or engine noise by over 90%. Bluetooth 5.0. An 800 mAh battery giving 15 hours of talk or music, 350 hours standby, and 3 hours to a full charge. IP67.
Count the numbers. Seven properties published as figures, including the charge time — which is the one nobody publishes and the one that decides whether the unit is ready on a Saturday morning.
Over 90% noise reduction. DSP and CVC are real techniques, the figure is specific, and no measurement condition is given: at what speed, at what frequency, measured how. Beside six figures that are plainly stated, it is the one to read as a manufacturer’s claim.
Between 74 € and 79 € across the German, French, Italian and Spanish Amazon stores, in the single reading behind this page.
Priced in local currency, which the euro range above deliberately leaves out, it also appears on the British Amazon store.
Nothing whatever came back from the American Amazon store, so the buy button there opens a search instead of an empty page.
What Keepa returned in the single reading behind this page. Availability and prices move without notice.
Prices quoted in this text were read on 18 September 2026. The live price is at the top of the page.
| Riders | Up to 10, range 2000 m (maker’s bullet) |
|---|---|
| Noise reduction | DSP and CVC, stated to reduce wind or engine noise by over 90% (maker’s bullet) |
| Battery | 800 mAh — 15 hours talking or music, 350 hours standby, 3 hours to full charge (maker’s bullet) |
| Bluetooth | 5.0 (maker’s bullet) |
| Protection | IP67 (maker’s bullet) |
| Music sharing | Between two paired B4FM units (maker’s bullet) |
| Amazon reference | B07GB1CYD2 (one reference across 5 Amazon marketplaces) |
| EAN | 0711765795666 |
Dust-tight, and protected against immersion in water to one metre for thirty minutes under the test conditions of the rating. It is a defined test, unlike the word "waterproof".
It is the maker’s stated talk time at 800 mAh. Talking continuously for fifteen hours is not what a touring day looks like, so it is a ceiling rather than a schedule.
A group of riders who want published numbers rather than published adjectives.
Same category, nearest prices. Only the specifications every one of them states are shown — a half-empty column compares nothing.
| Model | Price | Amazon reference |
|---|---|---|
| LEXIN B4FM | 64 £ | B07GB1CYD2 (one reference across 5 Amazon marketplaces) |
| MidingChai F10Pro | 52 £ | B0GWMFD9XP (one reference across 5 Amazon marketplaces) |
| Cardo Spirit | 99 £ | B09MQ7R1D8 (one reference across 6 Amazon marketplaces) |
| Yosoo Health Gear BT12 | 22 £ | B08FSNZ52Z (one reference across 1 Amazon marketplace) |
At 64 £, it sits 0 % against the 64 £ median of the 5 models in this category published here.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom. Listed is not the same as in stock — availability changes daily.
Details checked on September 18, 2026.
Specifications: manufacturer sheet and Amazon product page. Prices and availability: Keepa. No product on this site has been physically tested.
Two-way intercom to 400 m · 32 mm speakers · waterproof · over-the-air updates
A two-rider Bluetooth intercom published at 400 m range with 32 mm speakers, waterproof construction, over-the-air software updates and stated pairing with any brand of Bluetooth headset.
Best for: A rider and a pillion, or two riders who always travel as a pair.
≈ $99 / £92 / €86
Mesh intercom · up to 24 in a group mesh · 8 km with six riders · 2.0 km Bluetooth
A mesh intercom publishing two mesh modes, a private group of up to 24, a range extendable to 8 km when at least six people are connected, and 2.0 km over Bluetooth intercom.
Best for: Riding in a group large enough that a paired chain of two-way links stops working.
≈ $315 / £184 / €199
Two riders to 1000 m · Bluetooth 5.3 dual chip · 1000 mAh, 30 h · IP67 · sold as a pair
A pair of intercom units published for two riders at 1000 m, on dual Bluetooth 5.3 chips, with a 1000 mAh battery giving up to 30 hours, IP67 protection and RGB lighting.
Best for: Two riders buying both units at once at the lowest price per unit here.
≈ €52
