In the video, a person is holding a black smartphone in their hands. The phone has a physical keyboard and a touchscreen. The person is using their thumb to press the screen lock button on the phone. The screen displays a message that says "Screen is locked. Press the lock button to unlock." The person then presses the lock button on the phone, and the screen turns on. The person then presses the screen lock button again, and the screen turns off. The person repeats this process several times, pressing the lock button to turn the screen on and off.