The video shows a person holding a smartphone and using the calculator app to perform a calculation. The person types in the numbers 13, 9, and 7 into the calculator and then presses the '+' button to add them together. The result of the calculation is 17, which is displayed on the screen. The person then presses the 'AC' (All Clear) button to clear the screen and start a new calculation. The video is shot in a vertical format and the person's hand is visible holding the phone.