100 lumens of affordable power and runtime in a lightweight compact body. 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