When you absolutely, positively need to be seen, day or night, rain or shine, trust CatEye’s brightest rear safety light. The ViZ450 features 5 LEDs, 300-degree visibility, OptiCube™ lens technology, and makes sure you stand out with the power of Daytime Hyperflash™ mode.Key Features:5 LEDs (450 lm),Up to 65 hours runtime,Focused lens for maximum visibility,Highly visible during daytime,Superior 300 degree visibility,Long rear beam projection,Clear OptiCube™ lens technology,Lithium-ion rechargeable battery,USB rechargeable (Micro-USB cable included),Low battery indicator,4 modes: Constant / Flashing / Group Ride / Daytime Hyperflash,Mode memory function,Battery 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 seatpost,Snap System™ bracket,Weight: Only 45g,Designed in Japan.Runtime:Constant (40 lumens):5 hrs,Flashing (40 lumens):65 hrs,Group Ride (130 lumens):10 hrs,Daytime Hyperflash (450 lumens):14 hrs,Charging time (From empty) : 3 hrs.Technologies:Opticube™: Our proprietary OptiCube™ lens technology maximizes brightness for greater visibility.,Snap System™: Allows riders to place rear lights on various locations in both horizontal and vertical orientations.,Side Visibility: Provides 300° visibility from the side to increase safety.,Low Battery Indicator: Alerts when remaining battery gets low,USB Rechargeable: USB rechargeable products recharge that batteries from any USB port.,Daytime: Can be used in the daytime.,All Weather IPX4: Can be used in rainy weather..