The video shows a person using a green pen to draw a line on a circuit board. The circuit board has various electronic components attached to it, including a battery. The person is drawing a line around the battery, which is connected to the circuit board. The video also includes text that reads "Earth ground battery negative," indicating that the person is drawing the line around the negative terminal of the battery. The video is shot against a blue background, and the person's hand is visible as they draw the line.