Looking for an upgrade in visibility and control?
SEEMEE 400 takes everything great about the SEEMEE 300—and turns it up a notch. With higher output, expanded visibility, smarter syncing, and deeper integration, it’s built for road cyclists and urban riders who expect more from their taillight.
360° Visibility, Trusted by Pros
- Both SEEMEE 300 and SEEMEE 400 feature Magicshine’s signature OptiTracing light, projecting a 360° glowing halo onto the road for all-around visibility—a favorite among pro cyclists for its unmistakable presence in low light condition.
- The Optillumin lens remains the same across both models, offering powerful rear and side illumination through a compact, clean design.
Instant Boosting Alert
- Both SEEMEE 300 and 400 feature brake detection—but SEEMEE 400 pushes it further with an instant 400-lumen burst triggered by an upgraded motion sensor. It reacts faster and brighter, giving traffic behind more time to respond and enhancing safety at every brake.
Next-Level Connectivity and Control
- As Magicshine’s flagship taillight, SEEMEE 400 brings unmatched integration and coordination to your ride.
- PelotonSync Flash lets multiple lights flash in unison—automatically syncing with nearby compatible Magicshine taillights. Your group appears as a unified presence, boosting visibility and cohesion on the road.
- FTR LightSync Control links seamlessly to the MJ-6558 remote for front-rear control at the push of a button. Prefer cockpit integration? The SEEMEE 400 connects directly with Garmin, Wahoo, and Hammerhead bike computers via ANT+—giving you effortless control right from your handlebars.
Built for Every Ride
- SEEMEE 400 delivers up to 107 hours of runtime, USB-C fast charging, and a lockout function to prevent accidental activation. Its IPX6 waterproof rating ensures all-weather reliability, while the quarter-turn mount offers quick, secure installation on seatposts or saddle rails.
- SEEMEE 400 is not just a brighter version of SEEMEE 300—it’s a smarter, safer, and more connected evolution. For riders who go farther and ride smarter, it’s the taillight that keeps pace.
