Display system: Extra-large LCD with digital display system Measuring method: Oscillometric method, automatic inflation, automatic measurement, 120 times memory with time and date displaying Pressurization: automatic air inflation by an imported air pump Deflation: automatic exhaust Cuff size: 475mm?135mm Machine size: 145mm?80mm?85mm Weight: 285g (excluding battery) Measuring accuracy: Within ± 3mmHg (0.4kPa) Blood pressure measuring range: 20mmHg?300mmHg (2.7kPa?40kPa) Pulse rate range: 30?180/min Pulse rate accuracy: Within ± 5% Power source: DC6V or 4?AA size batteries Battery life: Approx.1 months with 3 min. usage per day Classification: Internal powered Equipment Type B Automatic power off: To be automatically cut off after 3 minutes of nonuse to save energy Environmental temperature for using: 5～40°C Environmental temperature for storage: -20～55°C Environmental humidity for using: ＜80%RH Environment humidity for storage: ＜95%RH Transport condition: Atmospheric pressure range: 525mmHg～795mmHg (70kPa～106kPa) Humidity range: Less than 95% Ambient temperature range: -5～40°C