Magicshine Seemee 400 ANT+ Smart Rear Light - 360° Visible, 100% Ready

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.

Features:

• Dual high-power LEDs output up to 400 lumens for strong road presence and added safety
• Optillumin lens ensures a well-balanced beam with extended side reach
• Signature OptiTracing light projects a 360° glowing halo for all-around safety
• 5 modes: Low, High, Night Flash, Day Flash, and Eco Flash — take your pick
• Smart brake sensor triggers a full 400-lumen alert for added stopping safety
• Auto sleep after 5 minutes of inactivity, wakes instantly with vibration
• FTR LightSync enables remote sync between front and tail lights for streamlined use
• ANT+ integration enables direct control via Garmin, Wahoo, and Hammerhead computers
• PelotonSync Flash syncs with nearby taillights for coordinated group visibility
• Lockout function prevents accidental activation during transport or storage
• Built with a lightweight aluminum housing for lasting durability and a polished look
• Powered by a 1600mAh battery, delivering up to 107 hours of runtime
• Quick quarter-turn mount fits securely on seatposts or saddle rails
• Mode memory function, easy-to-read indicators and USB-C rechargeable
• IPX6 waterproof rating, built to withstand harsh weather
• Warranty: 1 year

Sizing Information

• Size: 400 Lumens
• Country of Origin: China