This is included in the Module package to make it easier for you to use. The proximity sensors can work well with the operating temperature of -25°C~70°C. There are 3 pins on this electronic component. It is important for the rate to be 500Hz so that the proximity sensors will work. To make proximity sensors work properly, the reed switch's internal contacts should be conducting 100mA current. You should set this electronic part's current to 10mA to maximize efficiency.