Specifications: Measurement Method: Oscillometric Display: liquid crystal digital display, Time: Month, Date, Time, Minute Measuring range: pressure: 0 - 300mmHg (0kPa-39kPa) Pulse: 40-200 beats/Minute Accuracy: Pressure: within+-3mmHg (0.4kPa) Pulse: within +-5% Min. scale: 0.1kPa/1mmHg Memory: 60 data memories (DWD-2102) 120 data (person A&B) (DWD-2103) Automatic power Off About 40 seconds after measurement is complete Battery Type: 4 AA Batteries Battery life: about 2 months with 3-min. usage per day Storage condition: (-4~131)F, (10~95)%RH Operation condition: (41~104)F, (30~85)%RH Dimensions (approx.) Monitor: 150?05?5mm Cuff: fits upperarm 22-30cm Weight (approx.) 180g (including batteries)