Ljc30a3-h-z/bx Dc 3 Wire Capacitive Proximity Sensor Switch Type: DC 3 Wire Type (Brown, Blue, Black) Theory: Capacitive Sensor Diameter of Head/Detecting Distance:28mm/1-25mm Supply Voltage/Control Output:DC 6-36V/300mA Size: 7.5 x 4cm/2.9" x 1.57"(L*Max. W)