Simply look at the color to know if your tire is low or normal.
Determine the correct tire pressure for your tires.
Inflate tire to correct pressure.
100% Brand New and High Quality
Install This new pressure cap tight.
Green shows that tire pressure is normal.
Yellow shows that the pressure is down about 5 pounds.
Red alerts you that the pressure is down by at least 10 pounds.
Packing content:
4pcs x Tire Pressure Indicator