It is included with the Cylinder, Threaded - M12 package as a convenience to you. A temperature of -25°C~70°C is a suitable operating temperature for proximity sensors. The supply voltage of proximity sensors should be set to 300V for maximum efficiency. It is important that the rate of the proximity sensor be set at 30Hz so that the proximity sensor switch can function properly. You need the reed switch's internal contacts to pass 200mA to work.