Medline Automatic Digital Blood Pressure Monitors are Accurate, Fast and Easy-to-Use. Our unit has automatic inflation, error detection and an easy one-button design to provide reliable readings. Logic circuitry allows this unit to customize inflation levels for individual patients. 8-bit processor provides accurate results. Large digital readout. Results can be stored in memory. All units include four AA batteries and detailed instruction guide. Unit w/Std Adult Cuff (fits arms 22-30 cm, 8.58"-11.70").