This is a very simple operation of the tail lights it is very easy to install has a strong light mode weak mode and stroboscopic light only need to change a button can control three patterns beautiful appearance let i love bicycle exercise very safe at night let me wait you dont need to worry about at home this bike taillight is good although the ride time will not be a lot i see the function of this product can also be placed on the car when the car after the emergency warning flash the night was pretty bright