Item Weight1.76 ouncesProduct Dimensions3.94 x 1.97 x 1.18 inches Compatible with Ninebot Gokart Kit (with Ninebot S MAX)/ Ninebot Gokart PRO/ Ninebot Gokart Lamborghini, it will give your car the finishing touch, adding a sense of competitive sports, visible speed, and warming up your love. The connection between Stopwatch and Segway Gokart is very simple, please follow the instructions, the connection is not successful, it may be that the Segway Gokart software version is too low . In addition to displaying the vehicle speed, it also integrates the function of controlling the driving mode. When it is turned on and connected, the mode can be switched by flipping the button, which is easy and convenient. (The vehicle must be at a standstill before the mode can be switched). Package List :Stopwatch Assembly *1 PCS Reminder: If you have any questions, please contact us, we will help you solve it within 24 hours!