The UB-351 Automatic Wrist Monitor benefits from a number of features developed by A&D for professional clinical use. A&D UB-351 has 90 readings memory function. It also incorporates the average value feature of stored data, as well as the WHO blood pressure classification indicator to allow users better control of their management programs. It also boasts A&D's IHB (Irregular Heart Beat) technology, pioneered by A&D in 2001 & incorporated into the full range of blood pressure monitors. Blood pressure is recorded with two numbers. The systolic pressure (higher number) is the force at which your heart pumps blood around your body. The diastolic pressure (lower number) is the resistance to the blood flow in the blood vessels. Both readings are measured in millimetres of mercury (mm Hg). A blood pressure reading between 120/80mm Hg & 140/90mm Hg could mean you're at risk of developing high blood pressure if you don't take steps to keep your blood pressure under control. A&D Medical: Our heritage A&D have been one of the leading provider of medical devices for both home healthcare & healthcare professionals worldwide since 1977. Since 1979, with the introduction of our digital blood pressure monitor for the home. A&D has continued to design reliable medical devices for both home healthcare & medical professionals. In 1984, we made home blood pressure monitoring common place by refining our oscillometric technology. The oscillometric method is the standard method for digital blood pressure monitoring in the home. Starting in the late 1980's, A&D expanded product portfolio to include ambulatory blood pressure, bedside & fully automatic monitors. Furthermore, due to the adverse health effects caused by devices that contain mercury, A&D developed a mercury-free sphygmomanometer. We strive for ' Honmono', welcome challenges & are relentless until we deliver solutions. Box Contains 1 x UB-351 Wrist Blood Pressure Monitor 1 x Instruction manual 2 x AAA Batteries