1. After CDI is turned on, the digital tube display the curve before the last shutdown. 2. Each time you the button, the number in the digital tube increase by 0-9 and be displayed in a cycle. 0 means no ignition, 1-9 means 9 ignition curves. (0 is the speed limit of 6000 rpm, 1 is the original-state, and 1-9 are all unlimited speeds. After installation, it can be adjusted to a knock curve suitable for the motorcycle engine) 3. The number be remembered after each , and the last ignition curve still be displayed after the power is turned off. 4. Ignition curve 1 means that the ignition angle is relatively low, and 9 means that the ignition angle is high. The ignition angle difference between each curve is 1-2 degrees. 5. According to different venues and road conditions, choose different ignition curves for matching. Type:Motorcycle Igniter Digital-Ignition Adjustable CDI Box Conditon:100% New 4 Pin CDI Box Applicable models:For CG125 CG-125 150cc 200cc Colour:Blue & Black Material:Plastic Package Contents: 1 * Motorcycle Ignition DC CDI Box 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.