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. Double Connection: double G3 / 4 "interface (with 3/4" NPT available). 6. The multiple contact terminal block, eight standard contacts. (There are multiple terminals to choose from) 7. spring loaded cam, free tool to debug. 8. China's first stainless steel SS316 valve limit switch box.