Instructions:

1. Click "Start" to begin the Cardiac Arrest and Chest Compressions timers.

2. Press "Stop" to pause the Chest Compressions timer when no compressions are being performed.

3. Click "Resume" to continue the Chest Compressions timer after stopping it.

4. When you are done, click "End" to stop both timers and finalize the calculation.

5. Use "Reset" to clear all timers and start over from zero.

The Chest Compression Fraction (CCF) is continuously calculated and displayed based on the time spent on compressions compared to the total cardiac arrest time.