The LEXIN B4FM is most likely the number-one selling budget motorcycle intercom on Amazon, and the numbers back that up. With over 1,180 reviews averaging 4.2 stars, the B4FM is one of the most fully reviewed intercoms available today. It allows up to 10 riders to connect via Bluetooth, has a waterproof rating of IP67, and allows two devices to share music. For riders looking for an affordable yet reliable intercom without paying premium brand prices, the B4FM has become the default recommendation. See how it compares to other intercoms on our intercom comparison table.
Communication and connectivity
The B4FM supports Bluetooth intercom for up to 10 riders. The ideal number of riders is 2 to 4. The higher capacity of 10 riders means you can chain connections across a large group, but the quality of the audio will suffer with each additional talker. For couples and small groups of 2 to 4, it works great. If you have a larger group and wish to be able to converse simultaneously, a mesh-based intercom would be a much better fit.
Audio and music sharing
The speakers work well for voice communication at moderate speed (city or highway) and adequate for playing music. While they are not an audiophile's dream, they will certainly meet your expectations for riding. Music sharing allows two connected B4FM units to listen to the same music stream simultaneously. This is a nice feature for couples who enjoy riding together and wish to share their playlist with each other.
Noise cancellation and FM radio
The built-in noise cancellation assists in filtering wind and engine noise during conversations. At lower speeds (city) and moderate speeds (highway), it works fairly well. Higher speeds or heavy winds may create challenges in maintaining a decent conversation. There is also an FM radio function that provides a secondary form of entertainment when you do not want to drain your phone's battery by streaming music from it.
Build quality and durability
Impressive for a budget-friendly intercom is the IP67 waterproof rating provided by the B4FM. The B4FM provides full dust protection and water immersion resistance, providing little concern about riding in the rain. In contrast, many less expensive intercoms advertise water resistance with no formal IP rating, so the B4FM's tested IP67 offers real reassurance regarding its waterproof capabilities.
Battery duration is suitable for an entire day of riding. LEXIN rarely publishes exact hours of usage, but based on numerous reviews from countless riders, the battery generally lasts throughout an entire ride day without issues. Charging time is reasonable, and overall the B4FM appears to be constructed sufficiently robustly to withstand several years of use.
The B4FM features a universal mounting system that will accommodate virtually all styles of helmets (full-face, modular, half). LEXIN supplies both a boom microphone and a wired microphone so you can select the method best suited for your individual helmet design.
Why the B4FM became so popular
So why did the B4FM earn its best-seller status? A combination of aggressive pricing, reliable core performance, and extremely wide helmet compatibility. By most measures, it is not the most advanced intercom available. It does not offer mesh networking or app control, nor does it possess Harman Kardon-quality speakers. What it does have is over a thousand reviews confirming it works reliably for all the things most riders need: talking with their riding partner, listening to music, hearing GPS directions, and answering phone calls.
The fact that it has a certified IP67 waterproof rating puts it head and shoulders above all those less expensive alternatives that claim water resistance without formal testing. Its ability to support up to 10 riders provides more than most riders will ever need for group rides. If you buy it as your first intercom for music and GPS, you always have the option to add other riders later without needing to upgrade.
What reviewers say about the B4FM
With almost 1,200 reviews, one of the deepest pools of any motorcycle intercom, the B4FM boasts a consistently high average rating of 4.2 stars, reflective of a product that performs its primary function well with several known limitations. The positive themes are very consistent: easy pairing, good sound quality for the price point, reliable waterproofing, and excellent value. Riders who purchased the B4FM as their first intercom are overwhelmingly satisfied. Couples who purchased matching units love the feature of being able to share music between units and how simple connecting two-way communication is.
The negatives are similarly consistent. Pairing larger groups (more than 2 or 3 riders) can be complicated and frustrating. Range can be shorter than expected in urban areas with lots of buildings or interference. Audio quality can be reduced when connected to a phone simultaneously while playing music. Long-term users report that rubber port covers wear out after a couple of years, causing the waterproof seal to fail.
Who should buy this intercom
For riders looking for a reliable, waterproof Bluetooth intercom that will not break the bank with premium brand prices, the LEXIN B4FM is highly recommended. It shines as a solution for couples and riding partners, and small groups of 3 to 4 riders work fine too. The large pool of reviews gives confidence that most riders can trust it to perform as advertised.
If you require mesh networking for larger groups, consider either the LEXIN MeshCom or Fodsports FX7. If you want premium audio quality or build refinement, Sena and Cardo remain top-of-class options. But pure value-wise, the B4FM has been difficult to beat at its price point. See the full comparison table for more options.
Frequently Asked Questions
How many riders can the B4FM realistically handle?
While it supports up to 10 riders, it works best with 2 to 4. Pairing larger groups gets complicated, and audio quality can degrade with many simultaneous connections.
Is the LEXIN B4FM actually waterproof?
Yes, it has a certified IP67 rating. Full dust protection and water immersion resistance. Rain riding is completely fine.
Can two B4FM units share music?
Yes, music sharing lets two connected units listen to the same music stream simultaneously. It works via Bluetooth from one rider's phone to both headsets.
Does the B4FM have FM radio?
Yes, built-in FM radio is included as an entertainment option that does not require phone streaming.
What helmets does the B4FM fit?
The universal mounting system works with full-face, modular, and half helmets. Both boom and wired microphones are included for different helmet types.
How does the B4FM compare to the LEXIN MeshCom?
The B4FM is Bluetooth-only while the MeshCom adds mesh networking for larger groups. The B4FM is cheaper and simpler, making it better for couples or small groups who ride together regularly.
Does the LEXIN B4FM support voice assistants?
Yes, it supports Siri and Google Assistant through your connected phone. You can make calls, get directions, and control music hands-free through voice commands while riding.