This blood pressure monitor is easy to use. It is positioned on the arm without discomfort for the wearer. It measures systolic and diastolic blood pressure, blood pressure, as well as heart rate (pulse). Its screen is clearly legible. Specific Data: Measuring range: 0 to 300 mmHg (blood pressure); 30 to 180 beats/min (pulse). Resolution: 1 mmHg. Measurement accuracy: Blood pressure +/-3 mmHg; Pulse: +/-5%. 120 MEMORY. Power Source: 4 * AA size batteries included. Low battery indicator. Complies with the European standard EN 1060. (not invasifs blood pressure) compliant with provisions of the European Directive 93/42/EEC (medical devices). Directions for use: Place the band around the arm. Turn on/off the device and press start to be measured. In order to have a fair to measure blood pressure, it is recommended that you do not drink of coffee and/or smoke before you take it. We must be the meal, preferably when sitting as the effort in the body.