The LEXIN B4FM is one of the most popular helmet intercoms on Amazon, and the numbers back it up. With a 4.3 out of 5 star average across over 5,400 reviews and a spot at number 16 in Powersports Bluetooth Headsets, it's proven itself as a serious alternative to Cardo and Sena at a much lower price point. This 2-pack supports up to 10 riders in group intercom, has IP67 waterproofing, and comes with a 2-year warranty. If you're looking at the intercom comparison table for group riding, this one deserves serious consideration.
Specs and Features
The B4FM runs on Bluetooth 5.0 with Qualcomm chip technology for fast, reliable connections. It supports up to 10 riders in group intercom mode with a 2km range between units. The speakers are 36mm Mylar coaxial drivers with DSP and CVC noise cancellation technology for clear audio even at speeds up to 120 km/h. The 800mAh battery delivers up to 15 hours of music or talk time with over 168 hours of standby, and charging takes about 2 hours via USB-C.
The B4FM is rated IP67 waterproof, which is a significant step above the IPX5 and IPX6 ratings on most budget headsets. It can handle heavy rain, snow, and even brief submersion without issues. The unit also features FM radio with station scanning, music sharing between two riders, and universal pairing that works with other LEXIN models and some third-party brands.
Each unit comes with two microphone options a boom mic for open-face and modular helmets, and a button mic for full-face helmets. The 2-pack configuration means you get two complete units in the box, making it a better deal than buying singles from competitors.
Performance and Sound Quality
The B4FM delivers good audio quality for an intercom unit in this price range. The 36mm Mylar coaxial speakers provide clear mids and highs, though bass response is limited as you'd expect from helmet-mounted speakers. At highway speeds with earplugs in, the volume is adequate for music and calls.
The intercom range is the standout feature. With 2km between units in open terrain, it beats most budget options and competes with mid-range Cardo and Sena units. Group mode works for up to 10 riders, though several reviewers noted performance is best with 4 or fewer riders. The music sharing feature lets two riders listen to the same song, which is nice for couples on tours.
What Amazon Reviewers Are Saying
With over 5,400 reviews, the B4FM has one of the largest feedback databases of any intercom on Amazon.
The positives from buyers:
Multiple reviewers who switched from Sena and Cardo units praised the B4FM as a more affordable alternative that delivers comparable performance. One detailed review from an ex-Sena user said the B4FM worked just as well for their needs at less than half the price. The battery life was frequently praised, with reviewers reporting 8 to 10 hours of actual saddle time with the unit left on for over 13 hours straight.
The waterproofing got consistent praise, with reviewers who rode through days of rain reporting no issues at all. Sound quality for phone calls was called out as clear, with callers reporting they could hear the rider better than in their truck according to one review. The universal pairing with different helmet brands and other Bluetooth devices was another frequently praised feature.
The negatives from buyers:
The main criticism is the group intercom performance with more than 4 riders. Several reviewers noted that connecting 4 or 5 units was reliable, but getting 8 or 10 to stay connected required patience and sometimes didn't work as expected. The pairing process was described as confusing by a few users, particularly when trying to chain-pair multiple units in the correct order.
Sound quality at high speeds was another area of mixed feedback. Some reviewers found the speakers adequate at up to 70 mph, while others with louder exhaust systems or less sound-dampening helmets struggled to hear clearly. Speaker positioning in the helmet makes a significant difference here.
Who Should Buy This
The B4FM is the best option for group riders who want 4 to 6 rider intercom without spending Cardo or Sena money. The 2-pack pricing makes it a great deal for couples or small groups.
Good for:
- Small to medium group rides (4 to 6 riders)
- Couples who want reliable intercom for touring
- Riders upgrading from single-headphone or no intercom
- Anyone who values IP67 waterproofing
- Snowmobilers and off-road riders
Not great for:
- Large groups of 8+ riders who need perfect mesh connectivity
- Audiophiles who want premium music quality
- Riders who want the latest mesh technology
Frequently Asked Questions
How many riders can connect?
Up to 10 riders in group intercom mode, though best performance is with 4 to 6 riders according to reviewers.
What's the intercom range?
2km or about 1.2 miles between units in open terrain. Dense forests or urban areas reduce the range.
Is it waterproof?
Yes, IP67 rated. It handles rain, snow, and brief submersion. One of the highest waterproof ratings available.
Can it connect to other brands?
The B4FM supports universal pairing with other LEXIN models including the G2P, GTX, G16, and MeshCom. It may also pair with some third-party brands.
How's the battery life?
800mAh battery delivers up to 15 hours of music or talk time. Over 168 hours standby. Real-world use with intercom active gives about 8 to 10 hours of ride time.
What warranty does it have?
2-year warranty from LEXIN. The manufacturer has a track record of responsive customer service according to reviews.
Bottom Line
The LEXIN B4FM is a proven, well-reviewed intercom system that delivers 10-rider group communication, IP67 waterproofing, and solid audio quality at a fraction of the price of premium brands. With over 5,400 reviews and a 4.3 star average, it's one of the safest bets in the helmet intercom market for riders who do their research before buying and want a tried-and-tested proven alternative to the premium brands like Cardo and Sena. With 5400 reviews backing it up, you're not taking a gamble for group riders who don't want to spend Cardo or Sena money. Check the comparison table to see how it stacks up against other group intercom options. It has earned its reputation through years of consistent sales and positive word of mouth from riders who actually use them.
