Material: aluminum alloy + plasticWaterproof grade: IPX5Light source: LED chip COBBattery capacity: 420mAhCharging time: about 1 hour 40 minutes(Grade 5 rainproof,Do not immerse in water for use.)Battery life:Always bright mode about 5 hours (brightne 60LM)Breathing light mode about 9 hours (brightne 50LM)Comet blinking mode about 10 hours (brightne 50LM)Slow flash mode about 9 hours (brightne 50LM)Mixed flashing mode about 11 hours (brightne 50LM)Energy-saving flickering mode about 26 hours (brightne 30LM) Smart/manual mode switching Double-click the button to switch between manual or automatic mode. When entering automatic mode, the AUTO indicator will flash; when entering manual mode, the AUTO indicator will be off. Manual mode: manual control switch lights, with brake sensing function.Automatic mode: light-sensing start-stop, mobile start-stop, brake inductionRemarks: In automatic mode, the taillights are dormant, and the brake sensing function is still available. USB charging When charging: battery light flashesFully charged: the battery light is solid green Two installation methods are supported. You can install the rear light on the saddle or seat tube according to your riding needs. Remaining power reminder in automatic modeGreen light flashes battery > 70%Blue light flashes battery 70%-20%Red light flashes battery Intelligent sensing The brakes are sensitive. When braking is detected, the taillights will enter a high brightne state for 3 seconds to alert the vehicles and pedestrians behind. Light sensor start and stop During the riding proce, when the surrounding light is dim, the tail light will automatically turn on, and where the light is strong, the tail light will automatically turn off after 30 seconds. Mobile start and stop When the light is dim, move the bicycle and the tail light will automatically turn on; after 30 seconds of static state, the tail light will automatically turn off. When paing downhill sections, the chip in the taillight will automatically correct the angle according to the program algorithm to ensure accurate braking induction. Optimized program algorithm, which can filter small swing motion and small bumpy road sections (the brake light will not be activated),However, a large swing action or a large bumpy road section and a shock-absorbing road section will activate the brake light warning (the brake light is always on). 180-degree visible COB light source, high brightne and large aperture