he Omron RS2 blood pressure monitor is clinically validated indicated for wrist circumferences of 13.5 to 21cm. Hard protective case and batteries included. Omron RS2 is recommended for individuals for its excellent quality / price ratio: People who prefer a wrist monitor for its great comfort. People who must measure their tension outside the home due to frequent outings or trips given their small size. People with too thick arm or with a large amount of subcutaneous fat in the arm that prevents the detection of pulse waves from the artery since the measurement of the perimeter of the wrist is not so different from that of a normal arm and the amount of subcutaneous fat that can accumulate in the wrist is much lower. People who have periodic dialysis who have deformed arteries due to calcifications at the level of the arm or elbow. Storage box 3 years warranty Batteries included