Proximity switches, inductive sensors, range: E57 Premium+ series, connection: 2-wire, design (external dimensions): M12 x 1 mm, rated operating voltage: Ue= 20 - 250 V AC, rated switching distance: Sn= 4 mm, installation type: non-flush, plug connection M12 x 1, contacts S = normally open: 1 S, material: stainless steel, protection class: IP67, standards and regulations: IEC/EN 60947-5-2