There are two points to highlight, which demonstrate how Omron’s B3WN series is able to achieve such excellent seal-ability. One point is the double sealed construction with seal rubber and film. The other point is that the switch bottom is also water-tight. Optimized parts material, shape and their processing condition achieve protection from liquid entering, even from the bottom of the switch. Excellent water-tightness is achieved without coating on the switch, which other switches require.