It is included with the Cylinder, Threaded - M18 package as a convenience to you. It is possible for proximity sensors to function well at -25°C~70°C. In order to achieve maximum efficiency, proximity sensors should be supplied with a voltage of 24V. It is imperative that the rate is set to 1.5kHz in order to ensure that the proximity sensors are functioning correctly. If you want proximity sensors to work well, the reed switch's internal contacts should pass 500μA current.