Welcome to tomobetter Features: Home electronic sphygmomanometer is compact and portable, and can measure bloods pressures any time and anywhere. It supports double person measurement data storage, and each person can record 99 groups of data, which is convenient for comparison and observation of historical data. LCD display ensures clear numbers for the elderly and you can see the systolic pressure, diastolic pressure and pulse easily. Clock function, you can set year, month, day, hour, minute by yourself easily. Arm type of design, you need to take off your coat or your sweater for measuring accurately. WHO sphygmomanometer indicate the status of bloods pressures, which is convenient for users to accurately judge whether the bloods pressures is normal. The Systolic pressure and diastolic pressure separately show people can judge the data whether in the normal range at first sight. Larger memory storage and irregular heartbeat detection,remind irregular heartbeat and show average measurement of the last three times. Low power detection function, detect low power under working state, LCD display shows low power. Dual power supply, battery powered or USB plug-in (cable and adapter required are not included). Specifications: Color: White Material: ABS + PC Measuring Arm Circumference: 220-320mm / 8.7-12.6in Measurement Ranges: bloods pressures: 20 ~ 280mmhg, pulse rate: 40 ~ 200 times / min Measurement accuracy: bloods pressures value ± 0.4kpa (± 3mmHg), pulse number reading value ± 3% Working Temperature: 10 ~ 40 Working Humidity: 40% ~ 85% Storage Temperature: - 20 ~ 50 Storage Humidity: 15% ~ 90% Display Screen Size: 41 * 61mm / 1.6 * 2.4in Voltage: 5V Battery Model: 4 * 1.5V (4 AAA alkaline, shipment without battery) Plug: USB (Not include) Product Size: 11.8 * 9.5 * 6.5cm/ 4.65 * 3.74 * 2.56in Package Weight: 313g/11oz Package Size: 13.7 * 10 * 8.6cm/ 5.4 * 3.9 * 3.4in Packing List: 1 * Sphygmomanometer 1 * Arm Band 1 * English User Manual NoBrand