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 CDI Digital Adjustable Name:Digital Adjustable Igniter Conditon:100% Brand New High class quality and very durable 6 Pin Power:DC Fitment:For GY6 50cc 150cc 250cc ATV Bike Motorcycle Color: Blue & Black Material: plastic Package Contents: 1 x Motorcycle Ignition 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.