This digital blood pressure monitor has a memory that can store 120 measurements and four user groups along with a time and date display so you can review your records. Package includes monitor, and travel plastic storage box so it is easy to carry with you on the go. NatureSpirit Advanced Digital Blood Pressure plus Heart Rate Monitor with Irregular Heartbeat Detector: * Large LCD display, simultaneously displays systolic, diastolic and pulse readings * Easy one-button automatic operation * Memory holds 120 measurements in four group with date stamp * Irregular Heartbeat Detection to alert user regarding their possible irregular heart beat * WHO indicator to give user immediate blood pressure level (normal, mild risk and high risk) comparison to the standards set by the WHO(World Health Organization) * Date and time display * Automatic shut-off * Comfortable, soft wrist cuff Digital Up-Arm Blood Pressure Monitor Specifications: * Classification: Class II, Type B * Blood Pressure measuring range: 20-300mm Hg, Heart rate range: 30-180 min * Blood Pressure measuring accuracy: ±3mm Hg, Heart rate: ±5% * Cuff size fits arm 8.6~12.6 inch (22~32cm) * Operating environmental temperature: 41Ãa F~104ÃaF (5ÃaC~40ÃaC) * Operating environmental Humidity:<85% * Storage environmental temperature: -4Ãa F~219ÃaF (-20ÃaC~55ÃaC) * Unit size: LxWxH 6.1x4.3x2.8 inch (15.5x11x7cm) * Weight: 0.9Lbs (405g) * Battery life: Approx. two months for normal usage