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 will send out control signal. It's widely used in machine, paper making, light industry for limiting station, orientation taking count, speeding trial ect. Product Name : Capacitive Proximity Switch; Model : LJC30A3-H-J/EZ; Wire Type : 2 Wire (Brown, Blue); Switch Appearance Type : Cylinder Type Theory : Capacitance Sensor; Output Type : NO(Normal Open); Diameter of Head : 30mm; Detecting Distance : 0-20mm Detecting Object : Metal or Nonmetal Material; Supply Voltage : AC 90-250V; Current Output : 400mA; Response Frequency : 7Hz Operating Temperature : -25°C to +65°C (Non-freezing Condition); Cable Length : 120cm/47 inch; External Material : Plastic, Alloy Net Weight : 252g; Color : Silver Tone, Yellow, Gray; Package Content : 2 x Capacitive Proximity Switch Only the above package content, other products are not included. Note: Light shooting 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.