The document provides instructions for using countdown timers in PowerPoint presentations. It includes timers ranging from 5 seconds to 20 minutes. To use a timer, the user copies it from the document into their PowerPoint presentation. When pasted in, the timers can be resized or formatted. They are preset to start on mouse click but can be modified to start automatically or on a button click. A sound effect plays at the end of each timer that can be removed or replaced. The timers are intended to add interactivity to presentations by timing student activities.