Key Features:3 LEDs (100 lumens),Focused lens for maximum visibility,Highly visible during daytime,Superior 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: 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 also fits contemporary (Kammtail) aero seatpost,Snap System™ bracket,Designed in Japan.Runtime:Constant (15 lumens):5 hrs,Flashing (10 lumens):70 hrs,Group Ride (35 lumens):11 hrs,Daytime Hyperflash (100 lumens):15 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.,Daytime: Can be used in the daytime.,All Weather IPX4: Can be used in rainy weather..