CatEye: The all new Tight Kinetic rear bike light packs a punch with Cateyes Kinetic brake technology. The built in acceleration sensor for Kinetic Mode that automatically changes the light from Low or Flashing mode, to High Constant mode to perform as a traditional brake light.Highly waterproof and durable against vibration, the 2 x AAA batteries gives incredibly long life performance whilst the 360 degrees of visibility give you the confidence to know that you ill be seen and be safeFEATURES:Built-in acceleration sensor to detect deceleration under brakingWaterproof design (Waterproof performance: IPX7)Long battery life of up to 180 hoursRugged body with resistance to vibration while ridingAchieves 360-degree light distributionHigh brightness, low power consumption design using 5 LEDsEquipped with 3 modes, 2 flashing modes + 1 constant modeEasy switching between constant and flashing with one buttonMode memory function turns the light on in last used modeFlexTight™ (SP-11) bracket can be fast and securely fixed to the seatpost and seatstay without tools.Compatible with clip (C-2) to attach to pocket or bag2x AAA batteries includedOnly 49g MODE: OUTPUT, RUNTIMELow: Approx. 70 hoursFlashing: Approx. 160 hoursRapid mode: Approx. 140 hours*The more frequently the brake (kinetic) mode works, the shorter the operating time.TECHNOLOGIES:Kinetic / Brake ModeAutomatically turns on High Constant mode when slowing down to work like a traditional brake lightOptiCube™Our proprietary OptiCube™ lens technology maximizes brightness for greater visibility.Side VisibilityProvides visibility from the side to increase safety.FlexTight™The innovative and versatile Flextight™ bracket can quickly and securely fastened to virtually any handlebar or stem with no tools requiredDaytimeCan be used in the daytime.All WeatherCan be used in rainy weather