Characteristics: Volume adjustment: The volume can be adjusted, which is a major advantage of this product. Product display: LCD digital display screen, large high definition display, clear reading. Site Measuring range: wrist Measuring range: blood pressure 0 ~ 280 mmHg (0 ~ 37.3 kpa), pulse rate 40 ~ 195 beats / min Measuring wrist circumference : 13.5 ~ 21.5 cm Measurement accuracy: blood pressure value ± 0.4 kpa (± 3 mmHg), ± 5% of pulse rate reading < br> Working environment: Operating temperature : 10 ~ 40 Operating humidity: 40% ~ 85% This product is an electronic blood pressure meter that can simultaneously measure systolic blood pressure, diastolic blood pressure and heart rate. This product is based on the principle of oscillometric design, which can quickly, accurately and reliably measure your blood pressure. Scope: This product is only suitable for adults. Application environment: This product is suitable for home or clinical use. The full voice diffusion volume can be adjusted From the start of the measurement to the analysis of the result, the whole process is diffused in English Exquisite and compact to travel with you anytime The body is small and light, so it can measure the pressure anytime, anywhere when traveling. business, travel, office, etc. Simple one-button measuring operation No need for tedious operation, automatic pressure, automatic measurement, automatic diffusion. <br > 1. Rest for 5 to 10 minutes before measuring blood pressure; 2. Avoid exercising, eating, drinking, coffee, black tea, bathing, smoking, etc. before measurement; 3. Blood pressure will rise if you intend to urinate, so please discharge before measurement. Package includes: 1 * blood pressure dynamometer (battery is not included in the package) Pay attention: Due to manual measurement, please allow slight dimensional tolerances Lighting in photography may cause chromatic aberration by compared to real life