It's included in Cylinder, Threaded - M12 so you can find it easily. It is possible to use the proximity sensors at -25°C~70°C. A proximity sensor's supply voltage should be set to 24V for maximum efficiency. It is important that the rate of the proximity sensor be set at 2.5kHz so that the proximity sensor switch can function properly. Reed switches are designed to use reed switches with internal contacts that pass 10mA current. DC circuits can withstand the maximum voltage of 24V without damaging proximity sensors. If the proximity sensors are in a DC circuit, their current shouldn't be lower than 12V, otherwise, there can be a problem.