The intercom that thousands of riders use has a lot to offer. Five thousand people have purchased and reviewed this LEXIN product. The B4FM has a track record built from years of use. That is the entire attraction to it. The B4FM is a two-pack model that will handle ten riders, comes with a two year warranty, and is IP67 water resistant. Check current pricing on Amazon.
Look at how it compares to other intercom products on our comparison table.
Specifications and Features
The B4FM uses Bluetooth 5.0 on Qualcomm chips for fast reliable communication. In group mode the B4FM allows you to communicate with up to 10 riders. Noise reduction using DSP and CVC keeps voice clean at up to 75 mph. Battery life is approximately 15 hours of talk time or music playtime per charge, with standby around 168 hours. Recharge via USB-C in about 2 hours.
Durable and water resistant, the B4FM's IP67 rating exceeds the IPX5 and IPX6 ratings of lower priced headsets. The B4FM is capable of resisting heavy rain, snow, and submersion under short periods of time. In addition to its primary features the B4FM includes an auto scan FM radio feature, music sharing between two riders, and LEXIN's Universal Pairing Technology that simplifies connecting other LEXIN models and some other brands.
Each purchase ships as two full units. This offers a significant value compared to purchasing individual headsets from major brands.
Performance and Audio Quality
For the class of products that it competes in, audio quality of the LEXIN B4FM is good. The coaxial speakers are made by Mylar and produce good treble and midrange with decent bass, about what you would expect from speakers stuck inside your helmet. Even with earplugs in, highway speed volume is still good, which is more than some budget units manage.
The real strength of the product is the intercom. Connectivity between units is very strong for the budget class of product, and it performs open air group chat for up to ten riders. Many reviewers commented that performance begins to degrade after four or five riders, so the sweet spot appears to be a small group. Music sharing works too, allowing two riders to listen to the same song while on a ride together. The 2-pack format means a couple or small group can get set up right out of the box without hunting for a second unit.
What Amazon Reviewers Are Saying
This product has one of the largest review bases on Amazon (over 5,400 reviews), making it as proven as a budget group intercom gets. That volume of feedback gives you a realistic picture of how it holds up in daily use before you spend a cent.
Positive Feedback From Customers
Many reviewers who were previously using Sena or Cardo praise the B4FM as being significantly less expensive than their previous models yet offering comparable performance. One reviewer stated that he used his new B4FM just as effectively as his old Sena at nearly half the cost. Reviewers consistently praised both battery life (reporting 8 to 10 hours of ride time per charge) and waterproofing (with many reporting riding through entire days of rain without issue).
Negative Feedback From Customers
Several reviewers had trouble with group mode intercom when connecting multiple units. While many people successfully connected four to five units, reliably connecting eight to ten units was commonly a pain point, especially sequentially. Some reviewers also experienced dropped sound quality at higher speeds, generally dropping off at around 60 to 70 mph depending upon both their helmet type and exhaust system. You can see current pricing on Amazon if you want to compare.
Recommendations For Purchasing
The LEXIN B4FM will suit any group rider who wants a 4 to 6 rider intercom without spending money on Cardo or Sena brand intercoms. The 2-pack pricing offers significant value for couples or smaller groups. If you are outfitting two riders, buying the pack once is cheaper and simpler than sourcing two single units, and both arrive ready to pair. For riders who do most of their group riding in small numbers and want a dependable, waterproof headset that will not break the bank, the B4FM checks the important boxes. See how it compares against other models on our comparison table.
Best For:
- Smaller groups (four to six riders)
- Touring couples looking for a reliable intercom
- Riders moving up from single headphones or no intercom
- Riders who want IP67 rated waterproofing
- Snowmobile and off-road riders
Not Recommended For:
- Larger groups of 8+ riders needing seamless mesh
- Audiophiles seeking premium music quality
- Riders needing the latest mesh technology
Frequently Asked Questions
How many riders can connect?
Up to ten riders in group intercom mode, but reviewers find the best performance with four to six riders.
How far does the intercom work?
Units communicate about two kilometers apart in open terrain. Performance drops in dense forests or cities.
Is it water resistant?
Yes, it is rated IP67. It handles rain, snow, and brief submersion, and is among the highest rated for water resistance.
Can it pair with brands other than LEXIN?
Yes, it supports pairing with other LEXIN models such as the G2P and GTX, and may pair with some third-party brands as well.
How long does the battery last?
The LEXIN B4FM comes with an 800 mAh battery and can play music or talk for up to fifteen hours. Standby time tops over 168 hours. Active intercom use results in ride time of roughly eight to ten hours, which matches what most reviewers report from a full day out. Charging over USB-C takes about two hours to top it back up.
What warranty does it offer?
LEXIN offers a warranty of two years. Reviews indicate responsive customer service from the manufacturer.
Bottom Line
The LEXIN B4FM is a proven and well reviewed helmet intercom that delivers group communication for ten riders and IP67 water resistance. It performs solid audio at a fraction of the price premium brands charge. Having been on the market long enough, you can trust its track record. With over 5,400 reviews and an average rating of 4.3 stars, it is one of the safest bets in the market for riders who do not want Sena or Cardo prices. Check the comparison table to see how it compares, and browse more intercom reviews for other options.
