Compatible Models:for Max G3 Electric Scooter Notes: Please confirm that your scooter is a for Max G3 Electric Scooter. You can adjust the speed control chip to achieve your target speed by changing the scooter's software version. This product can reach a maximum speed of 40 km/h without replacing the motor, Bluetooth board, or a higher-powered controller. Installation Steps: 1. Turn off the vehicle. Unscrew the screw on the handlebar below the display and store it in a safe place. Open the handlebar. You see a wire connected to the display with a plug in the middle. Unplug it. 2. Insert the tuning chip between the display and the wires, ensuring the is aligned and inserted to avoid damaging the pins. Then, position the tuning chip in the center of the handlebar and reinstall the screws that were removed. Normal vehicle use: 1. Users can access and display all vehicle data, such as serial number and battery level, through the official app or apps. 2. Please note that for this EV controller, firmware upgrades or controller flashing using the official app or apps fail. 3. Users can configure EV parameters, such as locking and unlocking, recovery, taillights, and metric and imperial settings, through the official app or apps. 4. Users can turn the EV on and off, turn the lights on and off, and switch the gear indicator normally. 5. Because of different batches, the appearance , but it not affect the function! 6. When fully , it can reach a speed of 40 km/h unloaded and about 35 km/h with a passenger. Version:European Color:Black Material:plastic Package Contents: 1 * 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.