The video shows a person using a smartphone to set a timer. The person's fingernails are painted yellow, and they are holding the phone with their left hand. They tap on the screen to select the timer function and then set the timer for 3 hours and 59 minutes. The timer is displayed on the screen, and the person taps on the screen to start the timer. The timer starts at 3:59:58 and counts down as the video progresses.