M18 Cylindrical. Four modes of detection in one unit Easy set-up at the touch of a button Self teach precise set-up 'multi-mode detection' Sensing distance dependent on mode of operation Through Beam Functionality using additional light source (thru-beam accessory) Programmable NO/NC switching Connection: pre-cabled or plug-in connector (M12 4 pin male) IP67 Protection rating Operating temperature range -15 +55 °C