I put them on my tires and they just kept leaking air. They are completely incapable of doing their job and are downright dangerous if the owner doesn't notice the air leak. Never should one have trusted such a cheap product that promises so much
Pros
Tri-color display: shows the tire pressure according to the identification color, green means the tire pressure is normal, yellow means the pressure is 10% below standard, about 5 pounds, and red reminds you that the Pressure 25% below standard at about 10 pounds.