. Easy use: The product will save your time in the
  troublesome checks prior to the driving as you
  are only asked to do is secure the tire
  pressure cap onto the air intake and look into
  sight to check for color variation which will
  indicate whether your tire pressure is at a
  normal level.
. Optimal safety: The gauge cap is provided to
  remind you from time whether to inflate the
  tire or the tire suffers damage from external
  force, so as to drive down accidents rate in
  high-speed driving or in emergency. With this
  gauge cap, you will enjoy enhanced protection
  in your driving.
. Uppgraded rigidity: Our valve caps may be used
  in all weather conditions as it is built by
  material of high insulation with water, oil
  proof properties. The casing has undergone a
  multi-ply rust proof treatment for it to last
  as long as quality tires for a period of some
  1.5 years. The product may be used repeatedly
  after inflating the tire.
. Safe--Under correct inflated pressure, the
  gauge will be 'Green'.
. Caution--When tire pressure is lower than the
  indicated range by 4-8 psi, the gauge will show
  'Yellow'. Inflate the tire to ensure safe and proper
   function.
. Danger--When the tire pressure is lower than
  8 psi, the gauge will reveal 'Red'. Immediately
  inflate the tire for safety concerns.
. Compact: 800 ~ 1200 cc : 26 ~ 30 psi
. Sport car: 1200 ~ 3000 cc : 26 ~ 30 psi
             3000 ~ 5000 cc : 32 ~ 36 psi
. Station wagon: 1200 ~ 2000 cc : 28 ~ 32 psi
                 2000 ~ 5000 cc : 32 ~ 40 psi
. Sedan: 1200 ~ 3000 cc : 26 ~ 32 psi
         3000 ~ 5000 cc : 32 ~ 40 psi
. Jeep: 1600 ~ 3000 psi : 26 ~ 32 psi
        3000 ~ 5000 psi : 32 ~ 40 psi