1. Press the kinetic energy key 3 to select the lock, and then press the setting key 4 to confirm. At this time, a horizontal line will appear below the lock, indicating that it has entered the locked state.

2. When the locking function takes effect, the buttons on the operation panel will be locked and cannot be operated.

3. Press the Adjust key and the Auto key for more than 5 seconds at the same time to return to the main menu.