DESC: Improved design with 30 reading memory and irregular heartbeat detection Traditional arm cuff design Automatic inflation Clinically proven accuracy Memory allows reacall of 30 previous measurements with time/date stamp Average reading feature gives average of up to 3 previous readings Large digital display Large arm cuff for arm sizes 13" to 17" See HEM-712CN2 model below for standard 9"-13" cuff size Operates on included AC adapter or 4 AA batteries (NOT included) Includes illustrated manual in english and spanish Two year warranty Click here to download the user's manual