This barograph A4004 replaces the A4003.
It’s based on a touchscreen (E-ink display), a rechargeable battery
and all the features of the A4003.
In addition to the barograph function, that is the atmospheric pressure as function of time, it also features temperature and rel. humidity as function of time. The sailing ship pictogram indicates that gale warning is turned on and you are safe. Gale warning on means if pressure drops 3 hPa or more within 3 hours or less, you get an alarm (both audible and on the screen).