Supported models: Suitable for Pro and Pro 2 models.If you want to install it on the M365 1s Essential scooter,you need to replace the 350W motor.Supported controller main chips:stm32, APM32.After switching the speed state,this state remain valid for a long time unless the user changes the state by himself,and it also remain valid after restarting.After installing the speed controller,each time the user switches the speed state,the entire switching process take . Scooter speed state switching: 1. The speed controller has two speed states: (1) Low speed state - the maximum speed is 20km/h. When leaving the factory, the default is "low speed state". (2) High speed state - the maximum speed is 38km/h Methods for switching speed states: Method 1: When the device is powered on, the brake pedal N times, then the accelerator pedal N times to switch the speed state. The default value of N is 3 when leaving the factory. The user can set the value of N on the wifi page. The setting range is 3-15 times. Method 2: After the user connects the speed controller's wifi with a mobile phone, open the wifi settings page and switch the speed state. Speed state switching process: (1) the brake pedal N times, then the accelerator pedal N times. The instrument alarm once and switching the speed state. (2) When the user switches to high-speed mode, the meter displays the number 38. When the user switches to speed mode, the meter displays the number 20. (3) After the state is successfully switched, the meter alarm once. Wi-Fi name and password: 1. The speed controller's Wi-Fi name is: SpeedRe + the last four digits of the serial number; 2. The default Wi-Fi password is: 99999999; 3. Resetting the Wi-Fi password: Every time you change the scooter or scooter controller, or the controller serial number, and then restart the scooter, the Wi-Fi password be reset to 99999999. Normal use of the scooter: 1. Users can access and display all scooter data, such as serial number and battery level, through the official app or apps. 2. Please note that for the Scooter Pro speed controller, if users use the official app or apps to upgrade the controller firmware or flash the system, the upgrade or flashing fail. 3. Users can use the official app or apps to configure scooter parameters, such as locking and unlocking, energy recovery, taillight constant on, and metric and imperial readings. 4. The scooter's instrument panel can display vehicle speed, gear position, battery level, headlight, metric and imperial readings, and Bluetooth connection status. 5. Users can normally power the scooter on and off, turn the lights on and off, and change the gear position indicator. Fault code display: The fault codes can be displayed normally, such as the following common fault codes: Throttle fault -14, brake fault -15, battery communication fault -21, overheating alarm -40, etc. Color:Black Material:plastic Package Contents: 1 * Electric Scooter Speed Controller 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.