Tire pressure valve that warns when your pressure starts to get too low. <2.5Bar
With the little hat on the tire valve, you keep track of the pressure so it doesn't drop too much without having to visit the tire pumping section of the gas station. Turn the knob on the valve and it identifies the pressure your tire currently has as normal pressure and indicates it as green. If the pressure drops a little, it is indicated as yellow, and if it drops significantly, the valve shows red. Simple and smart!!
Conversion table for different air pressure units:
10kPa = 0.1 bar = 0.1kg/cm2
  
Bar       PSI      kPa            
2.5      36      250
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