This heart rate monitor is not a prank, it actually works! By placing your finger on the camera of your phone, the app monitors color changes that are related to your pulse and delivers highly accurate heart rate data. This product is constantly tested by doctors, nurses and fitness professionals and it really works! Now you have a surefire way to keep tabs on your heart rate in the palm of your hand. Whether at the gym, on a run, or just after a casual tennis match, this meter will provide you with reliable data. With this app you can: - Check your heart rate. - Check a real time PPG graph which shows your every heartbeat. - Monitor your cardio workouts in real time. How to use: Gently place the tip of your finger on the camera lens so it completely covers it. Hold your phone steady. (DISCLAIMER: This app is not a piece of professional medical equipment, and while its readings are very accurate, the program is not intended for professional medical use. By downloading this app, you acknowledge that the app is to be used in a casual way to approximate your heart rate during exercise and not as a replacement for professional medical equipment. When seeking expert medical advice, consult your doctor or personal physician.)