The heart rate chest belt kit contains a chest belt and a 5.3K Hz AM receiver module. The heart rate measure kit can be used to monitor the heart rate of patients and athletes, meanwhile the result can be displayed on a screen via serial port and saved for analysis. The entire system has lots of advantages, e.g. high sensitivity, low power consumption and portability. Because the modules communicate with each other via AM, it is very convenient to let you move (notice that the effective distance is 30cm).