Features: 1-dimensional visual indicator, high-contrast color design, the whole point of view the valve position. 2. Meet the NAMUR standard, to maximize compatibility. 3. The anti-off screws, bolts removably attached to the cover when not fall off. 4. Ambient temperature: -25 ~ 85 ℃, the lowest reach -40 ℃, protection class: IP67. 5. The die-cast aluminum housing, anti-corrosion, polyester coating. 6. Double Connection: Dual 3/4 "NPT interface (with G1 / 2", G3 / 4 ", M20 * 1.5 available) 7. multiple contact terminal blocks, eight standard contacts (there are more than one. Terminal options) 8. spring-loaded cam, free tool to debug. 9. One of the smallest explosion-proof valve position switch for domestic type.