Operating instructions: Enter the interface after power-on and full display. The first line displays real-time time, calories, riding distance, total riding distance, riding time, total riding distance, etc. Press Mode to switch the function of the first line (left button) In the current function interface, press and hold the mode key to enter the setting or clearing state. For example, in the TOTAL _DIST mode, press and hold the mode key to enter the setting state. In the setting state, continue to press the mode key for bit selection and the set key for addition and subtraction until the bit selection is over. Only the total riding time, total riding distance and real-time time can be set, and everything else is cleared The second line shows the riding distance. Press the mode key and the set key at the same time to enter the kilometer and mile unit setting, wheel circumference setting and weight setting. The default wheel circumference of 2060mm is also by the mode key, and the set key is added and subtracted. After setting the wheel circumference, 070 will be displayed, representing the default weight of 70Kg. The third line shows the current speed, maximum speed, average speed, temperature, kilometers or miles. Press the set key to switch functions; short press to switch functions; long press to clear. Backlight time default; The lighting time is 5s when it is 18:00 and less than 06:00. Press and hold the LED light-on key for about 3 seconds to turn on the backlight constant-on function, and then press and hold for 3 seconds to turn off the backlight constant-on function. German regulations prevent , which can control the light within a certain range, and it is to without dazzling and disturbing people. Horn/headlight double-line control, no need to leave the handlebar, easy to operate and safely, high-decibel electronic horn, 120 decibel sound can drown out the noise, which can quickly remind passers-by High-definition LCD screen, reading more clearly, various modes can be switched at will, and the total mileage/total driving time/hour hand/stopwatch/calorie can be switched at will. Intelligent induction automatically wakes up, goes to sleep automatically after 3 minutes of non-use, and wakes up automatically when it senses vibration, which increases durability. Life-class waterproof, no fear of splashing water in , no fear of sudden rainy weather, but try not to get caught in the rain for a long time Name: bicycle headlight wireless code table Material: ABS+ electronic components Weight: about 311 grams Color: black Type: bicycle accessories Power supply: 3.7V (lithium battery) Keys: (MODE key +SET key +LED key) External key: LED key+buzzer key Package Contents: 1 x Meter lamp body 1 x USB cable 1 x Install components Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.