Product Name blood pressure apparatus Model No. 1016B Measure unit mmHg(kpa) Minimal scale: LCD column 2mmHg(0.26kpa) Numerical display: 1mmHg(0.13kpa) Measure method stethoscope Measure scope LCD 0-300mmHg(0-40kpa), Numerical display: 0-300mmHg(0-40kpa) Overpressure warning LCD top will flash when pressure is more than 315 mmHg(42kpa) Available discrepancy +/-3mmHg(0.4kpa) Pulse rate 30-200Min, +/-5% Depressurization manual by air release valve Power supply 4.5V, AA*3, or USB type AC Adapter Relative humidity 30-85% Operation environment: +10°c-- +40°c Store environment -10°c--+60°c