Review on ANKIA Car Tire Pressure Monitoring Valve Stem Caps Sensor with 3-Color Eye Alert (Pack of 8) by Justin Hill

I do not recommend this product. I installed them in a Kia Soul and the next day the right rear tire blew out while my daughter was driving down Biscane BLVD, luckily it didn't happen while she was on the freeway. I have serviced the tire and checked for punctures or other imperfections, they were not found. However, when I reinstalled the Air Alert valve cap, I immediately noticed that the tire was losing air pressure due to the clear plastic cap indicator. In this case she was very lucky. If the transparent cover had come off completely, things could have been a lot worse. I decided to return with a regular cap and gauge. In other words: If the turn signal is defective, the tire cannot hold the pressure. They have no built-in check valve in case of failure. Sorry, but the old method is safer.