Smart Bike Tail Light Mutilife Rechargeable Rear Bike Light Brake Sensing Bicycle Lights Rear Bicycle Flashlight Safety Red Led Taillight Ultra-Bright LED Warning Bicycle Flashlight

How to turn to Auto mode ? Press the button to turn the cycling tail light on, then press the button twice to change the different mode(auto sign turn on green light, auto mode open). What is the auto mode ? If you enter auto mode, the bike tail Light turn on automatically when you are riding in low bright area and turn off in High bright area. Also,  the tail light will turn on automatically and switch to brake light mode when decelerating or braking. Can it the tail light be used for a long time? Built-in large rechargeable polymer lithium battery, the rear bike light run time can be up to 30+ hours and with a full CNC aluminium alloy chassis, it can prolong the lifespan even if you have met heavy rain. Compared with other bike tail light, what are the advantages of this ?  Build with COB LED and better lens, which offers high visibility at night but not dazzling so that it makes you more visible for other road users All clearly visible for the night no matter rain or fog.Very suitable for friends who like to ride at night. Keep you are safe. Automatically turn on/off depending on the light intensity, braking and motion Automatically switch to sleep mode to save power. Kindly Notice: *Manual mode needs to switch on/off the light manually. package list Mutilife Smart Tail Light *1 Micro USB cable*1 Seat Post Mount Rubber Bracket*1 Cushion Mount Rubber Bracket*1 User Manual*1 Zip-Tie *2