Here is the first rocker switch designed to run a minimum of one million mechanical cycles and withstand extreme environmental conditions. These rugged-duty rocker switches feature moistureproof and dusttight to IP64 & M8805 Design 2 seal. Watertight to IP68 available(contact factory). Watertight that will withstand direct water spray; and protection against extreme shock and vibration. Designated OTTO U2-277 and U2-278, these rocker switches are ideal for use under severe conditions found in material handling, heavy equipment such as off-road and construction equipment, and other outdoor applications.