Description: Power supply: DC 5V (USB not included) (4*AAA not included) Measurement Method:Oscillographic measurement method Measurement Range:Pressure-0-280mmHg(0-37.3kPa);Pulse-40-199 beats/min Accuracy:Pressure-Within L 3mmHg; Pulse:Within L 5% Storage Capacity:2X99 memory storage Operating Temperature:5-40,15%-80%RH Storage Temperature:-20-55,10%-93%RH Measuring Range:About 220-320mm Product Weight:About416g(Batteries not Included) Dimension:1269860mm Pressure mode:Automatic pressure mode Exhaust way:Automati rapid exhaust Pressure Testing:Semiconductor pressure sensor Pulse Testing:Semiconductor pressure sensorPackage includes: 1 x Full-automatic Upper Arm Blood Pressure Monitor 1 x Arm Cuff 1 x User Manual 1 x Storage Bag Notice: Please allow slight dimension difference due to manual measurement. Please consider the actual sizes in the listing as the pictures are generally enlarged to show detail. Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. Brand:Willstar It can measure the systolic and diastolic pressure and the pulse in seconds. With the adjustable cuff from 22 to 32 cm it is suitable for the most frequent arm measurements Easy to read: with a large LCD display, it measures blood pressure and heart rate quickly, and is easy to read Irregular heart rate indication: once it detects an irregular heartbeat, it will be indicated and alerted to this abnormal signal instantly The large size of the bracelet fits the circumferences of the arm from 22 to 32 cm (8.7 "to 12.6") The blood pressure monitor is powered by 4 AA batteries (not included), or with an AC adapter (not included). Practical to use and carry anywhere if used with AA batteries