1. After CDI is turned on, the digital tube will display the curve before the last shutdown. 2. Each time you press the button, the number in the digital tube will increase by 0-9 and will be displayed in a loop. 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 will be remembered after each press, and the last ignition curve will 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% Brand New with lead 9-segment Digital Adjustable CDI 4 Pin Fitment:For 50cc 70cc 90cc 110cc 125cc 140cc 150cc 160cc ATV Quad 4 Wheeler Pit Dirt Bike Motorcycle Colour:Blue & Black Material:Metal+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.