Magicshine SeeMee 400 Smart Rear Light

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.