Power source 45 size aa batteries 1.5v x 4 ac adaptor 11 47 220v dc6v 47 500ma br bull pressurization manual pressurization br bull depressurizaton 47constant45air45release valve system br bull deflatin 47 manual air release valve br bull memory 47 built 45 memory enabling display of the previously measured value and current measurements br bull automatic power off 47 to be automatically cut off after 2 minutes 30 seconds of non use to save energy br bull battery life 47 approx.6 morths with 3 min usage per day br bull operating environment 47 10 c 40 c, less then 8537 rh br bull storage environment 47 10 c 60 less then 8537rh br bull dimensions 47 122 40w41 x84 40d41 x 41 40h4147mm br bull weight 47 approx. 270g40including 4 batteries41 p