Pumping out an attention-grabbing 300 lumens with OptiCube™ lens technology, the versatile ViZ300 stands out with the power of Daytime Hyperflash™ mode and the friendliness of Group Ride mode.Key Features:3 LEDs (300 lm),Highly visible during daytime,300 degree visibility,Long rear beam projection,OptiCube™ lens technology,Lithium-ion rechargeable battery,USB rechargeable (Micro-USB cable included),Low battery indicator,4 modes *Charging time: 3h,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 comtemporary (kammtail) aero seatpost,Snap System™.Runtime:Constant (30 lumens):5 hrs,Flashing (30 lumens):45 hrs,Group Ride (100 lumens):8 hrs,Daytime Hyperflash (300 lumens):10 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..