2 pcs Inductive Proximity Switch: 1 pcs LJ18A3-8-Z/BX 8mm & 1 pcs LJ12A3-4-Z/BY 4mm It is a component widely used in automatic control industry for detecting, controlling, and noncontact switching. When proximity switch is close to some target object, it send out control signal. It's widely used in machine, paper making, light industry for limiting station, orientation taking count, speeding trial . Metal shell, DC type, 4mm detecting distance, 3 wire system.Power supply inverted connecting protection, short circuit protection, non-contact detecting device. Product Name: Inductive Proximity Switch; : Inductive Type Sensor Model: LJ18A3-8-Z/BX & LJ12A3-4-Z/BY Switch Appearance Type: Cylinder Type Wire Type: DC 3 Wire Type (Black, Brown, Blue); Output Type: PNP, NO; Detect Object: Iron Current Output: 300mA; Supply Voltage: DC 6-36V; External Material: Plastic, Metal Color: picture color Diameter of Head: 18mm / 12mm Detecting Distance: 8mm/ 4mm Cable Length: 1.1M/43.3 inch Package Content: 2 x Inductive Proximity Switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.