Electrical design: NPN; Output function: normally open; Sensing range: 4 mm; Housing: Threaded type; Application: Inductive sensors for welding applications; Magnetic-field immune: yes; Max. electromagnetic field immunity: 300 mT; Operating voltage: 10...30 DC V. Dimensions: 65 x 12 x 1 mm. Weight: 0.028 kg. Manufacturer reference: https://www.ifm.com/us/en/product/IFW211