Product dimensions: 7.56 x 6.84 x 3.1 (without bracelet) Weight: 280 g Storage temperature: -20 - 50 Storage humidity: 15 percent - 90 percent Operating temperature: 10 - 40 C. Operating humidity: 40 percent - 85 percent Display: LCD digital display Measurement method: pulse sampling or oscilloscope assay Measuring range: Hypertension or Hypotension: 20 mmHg - 280 mmHg Pulse: (40 to 200) times or min or accuracy: 3 mmHg 0.4 kPa or pulse: 3 percent of the measured value within Voltage: 3V Power: 2 AAA alkaline cell (not included) Package includes: 1 piece of blood pressure monitor (Without batteries) Accurate and reliable: the pressure accuracy is 3 mmHg and the pulse measurement accuracy is 5 percent . It is easy to closely monitor the health of you and your family. It has advanced measurement technology to give you the most accurate readings. Easy to read: The blood pressure monitor has a tri-color, backlit screen so you can read clearly even at night. Just press a button to operate, which is very easy for the elderly. Effective health monitoring: You can quickly measure blood pressure and pulse and detect and monitor abnormal heart rhythms, thus preventing serious damage to organs and blood vessels.