Features:Function: Light with speed meter/horn/battery status4 light modes: high bright. low bright. flash. yellow light6 horn ring: whistle. alarm. trumpet. didi. jiji. jiujiuLithium battery inside. 2-3 hours charge. can use 3-5 hours. Specification:Size: 10.5x4.1cmWeight: approx. 170gMaterial: ABS Package include:1 x Bicycle Light  

Installation method

2 seconds after the power is fully displayed. the display is as shown in A. The upper part is the current battery level indicator. and the lower part is the code table unit setting. The default is metric system. Press the SET button once to switch to the inch system. Press MODE and SET key for 5 seconds at the same time. the system enters soft start. all settings are cleared. and the system repeats the above operation as if it is newly powered on. The display is like the B chart. Press the SET button again and the unit switches to km/h again.   After setting. press the MODE button to determine the speed unit. At this time. the display will be like C chart. Among them. 208 is blinking. 208 is the default tire circumference. Press SET key at this time and the tire circumference will increase sequentially (209-210-220--315-10-11-12--)The unit is CM. The setting range is 10CM~315CM  After setting up. press MODE key. Get into The initial total mileage setting. Display the following D diagram. One of the first 0 in flash At this time. Press the SET button.Total mileage data will automatically increase.  After setting up. To exit The total mileage of the initial setting. The display is as shown in E. The 1238.6 is the initial mileage set number. If there is no set initial mileage The F diagram is displayed. At this point. all the initial settings of the code table are set and the system enters the standby state. If there is no key action after power on. the system will wait for 10 seconds and automatically enter the default setting (tire circumference 208CM. initial total mileage is 0.0)