The I9 offers a large display, Lithium Ion batteries, cross loc mounting, weather proof, auto conversion from MPH to km/H, dot matrix display, energy saving, smart start and stop and easy installation. The IW10 offers wireless connectivity. 9 Function. Speed comparator. Current speed. Average speed. Maximum speed. Trip distance. Trip riding time. Clock. Odometer set. 2 Wheel sizes. CO2 offset. Material: Plastic.