Compact bright and versatile the ViZ150 stands out with high visibility from OptiCube™ lens technology and Daytime Hyperflash™ mode in an economical package. FEATURES: 3 LEDs 150 lumens 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 27g Designed in Japan RUNTIME: Constant 20 lumens：5 hrs Flashing 15 lumens：70 hrs Group Ride 50 lumens：11 hrs Daytime Hyperflash 150 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 VisibilityProvides 300° visibility from the side to increase safety. Low Battery IndicatorAlerts when remaining battery gets low USB RechargeableUSB rechargeable products recharge that batteries from any USB port. DaytimeCan be used in the daytime. All Weather IPX4Can be used in rainy weather.