Product Name : Capacitive Proximity Switch;Switch Appearance Type : Cylinder Type Theory : Capacitance Sensor; Output Type : NPN NO(Normal Open); Diameter of Head : 18mm; Detecting Distance : 1-10mm Detecting Object : Metal or Nonmetal Material;Supply Voltage : DC 6-36V; Current Output : 300mA; Response Frequency : 100Hz Size : 7.5 x 4cm/3" x 1.6" (L*Max. Dia); Material : Plastic, Alloy