Cateye: 150 Lumen power and runtime in a compact lightweight body. The all new ViZ150 rear bicycle is compact, bright, and versatile and is a light that stands out with great visibility, thanks to the clear OptiCube? lens technology and Daytime Hyperflash? mode, all in an affordable package. A fully featured rear light, the ViZ150 replaces the Rapid X and comes with 4 essential modes including a group ride mode and flashing mode which delivers a remarkable 70 hours of runtime. The innovative new Snap System? bracket is simple to fit and place on your preferred position on the bike. The ViZ150 with its 150 lumen high power makes this the ultimate rear bike light to give you confidence when riding day or night in any condition. FEATURES:3 LEDs (150 lumens)Focused lens for maximum visibilityHighly visible during daytimeSuperior 300 degree visibilityLong rear beam projectionClear OptiCube? lens technologyLithium-ion rechargeable batteryUSB rechargeable (Micro-USB cable included)Low battery indicator4 modes: Constant / Flashing / Group Ride / Daytime HyperflashMode memory functionBattery 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 seatpostSnap System? bracketWeight: Only 27gDesigned in JapanRUNTIME:Constant (20 lumens):5 hrsFlashing (15 lumens):70 hrsGroup Ride (50 lumens):11 hrsDaytime Hyperflash (150 lumens):15 hrsCharging time (From empty) : 3 hrsTECHNOLOGIES: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 lowUSB RechargeableUSB rechargeable products recharge that batteries from any USB port.DaytimeCan be used in the daytime.All Weather IPX4Can be used in rainy weather.