If the tyre loses pressure, it does a beep then a tyre symbol in orange that stays on annoying you. Look through all the menus and eventually a plan of the car comes up on the screen showing which tyre it is. Its a good thing as it saves kicking the tyre to check pressures.
My battery powered tyre pump accurate and reading half a PSI at a time as it climbs during pumping.
Cost is near £100 with large battery and charger but it will pump up many tyres on a charge. There is a pump in the car but not as good as mine in the garage. Never used the supplied pumps that come with the car. Too much messing about connecting wires and not much power.