Question: How does it work with 3 colors?
Answer:If pressure is adequate you will see solid green, as pressure lowers the green turns to yellow, and if pressure lowers more the red color becomes visible.
Question: How will I know if it will fit?
Answer: These caps are standard and fit on any car.
Question: Can you leave these on all the time?
Answer:Yes! These pressure-gauges are meant to be left-on.
Question: Is this legit? Why are there so many ads showing similar to this product?
Answer:It has come to our attention that some online stores are selling the same product that we have but don't deliver the exact product as advertised.
Neo Future Store sells the HIGHEST QUALITY STANDARD of this product.
Question: Do you have to remove them to put air in your tires?
Answer: Yes, it needs to be disassembled. It's as easy as removing a tire valve stem cap.