Control Board Assembly For Segway ES1/ES2/ES4 (V2)Non genuine controller suitable for ES1 ES2 ES4 models. Activation is not needed. We have tested this on ES2 model and it works well. Key differences from the original unit: Has 2 speed modes. 17km h and 25 30km h. Speeds can be modified by installing custom firmware through ES_downG. On this version 2, bottom lights are activated and working as per original controller. While it can handle second battery, we do not recommend to use it as it might blow