With 300 lumens of output and advanced OptiCube lens technology, the Cateye VIZ 300 Rear Light delivers high-visibility safety in all conditions. It features a powerful Daytime HyperFlash mode for standout performance during daylight, and a Group Ride mode that reduces glare for others. Designed for compatibility with modern aero posts and built for long-lasting runtime, the VIZ 300 is engineered for visibility, ease of use, and reliability.Key Features and Benefits:300-lumen Daytime HyperFlash mode: Uses intense bursts of light to cut through daylight. This helps alert drivers from a greater distance, improving safety during daytime riding.OptiCube lens technology: Focuses and shapes the beam for maximum output and wide-angle visibility. Ensures you are seen clearly from multiple directions, even at long range.Group Ride mode at 15 lumens: Reduces brightness without sacrificing visibility. This helps prevent glare for other riders, keeping group rides safer and more comfortable.Four lighting modes: Offers Constant, Flashing, Group Ride, and Daytime HyperFlash settings. Allows you to adapt to changing light and traffic conditions for consistent visibility.300-degree visibility: Emits light from a wide angle using three LEDs. Enhances side and rear visibility to make you more noticeable at junctions and roundabouts.Snap System seatpost mount: Includes the SP-15 bracket for secure fitting on standard and aero seatposts. This ensures the light stays in place, even on rough roads.USB-C rechargeable Li-ion battery: Provides up to 45 hours of runtime depending on mode. Saves money on disposable batteries and ensures dependable power on long rides.Battery Auto Save and low battery indicator: Automatically switches to flashing mode when power runs low, and displays a warning light. Maintains essential visibility while preventing unexpected shutdowns.Built for riders who need to be seen in both day and night conditions, the VIZ 300 delivers maximum rearward and side visibility through a focused beam and high-lumen output. The USB-C rechargeable battery supports long runtimes with minimal downtime. Its simple seatpost mounting, water resistance, and intuitive mode memory make it a low-maintenance, high-performance lighting solution.Stay visible and ride with confidence using a rear light designed for performance, practicality, and peace of mind.Specification:3 LEDs (300 lm)Highly visible during daytime300 degree visibilityLong rear beam projectionOptiCube lens technologyLithium-ion rechargeable batteryUSB-C rechargeable (USB-C cable not included)Low battery indicatorFour light modes (Constant / Flashing / Group Ride / Daytime HyperFlash)Mode memory functionBattery Auto Save (The mode automatically changes to flashing when the battery power gets low.)New seat post bracket SP-15 which fits contemporary (kammtail) aero seatpostSnap SystemDimension: 25 x 75.5 x 34 mmWeight: 47g (with batteries)Light source：Red LED X3Battery：Li-ion rechargeable batteryRuntime：Constant (30 lumens)：5hrsFlashing: (30 lumens)：45hrsGroup Ride (15 lumens)：10hrsDaytime HyperFlash (300 lumens)：10hrsRecharge time：3hrs (0.5A)Mount size：φ21.5-32mm. Fits up to 130mm outer circumference. (SP-15)Water resistant: IPX4Other: Battery auto save, Low battery indicator, Light mode memory