Features: -It uses a three-color display, and different colors indicate whether the user's blood pressure is normal.-It uses a wrist measurement design, which is convenient for measurement, good fit, and reduces errors.-One user can store 99 sets of memory values (up to 2 users) to manage blood pressure scientifically.-There is a voice prompt during the measurement process to prevent the elderly from being unable to measure.-Built-in 300mAh rechargeable battery, it can standby for 30 days after fully charged and can be used more than 100 times.Specification:Measuring range: 0-280mmHg (0-37.33kPa)Pulse rate: 40-185 beats/minApplicable wrist circumference: 13.5cm-19.5cmAccuracy: pressure+3mmHg (within +0.4kPa)Pulse frequency: accuracy +5%Memory: 2*99A.