Features: 1. Easy button control and large display allow for smart operation and clear viewing experience, user friendly design can be suitable for most people, even the senior users can operate it effortlessly by themselves, no need the guidance of others. 2. Built-in premium chip can deliver precise measurement and smart voice prompt, allows you to start taking your blood pressure at home with accuracy. 3. Adjustable arm cuff band can fit arm circumferences of 22 to 32cm(8.7"-12.6"), widely compatible and applicable to family users. 4. Memory function can record 99 groups of measuring records to help remind the daily measurement results and 2 user accounts can fully meet the demands for your parents at the same time. 5. IHB heart rate test can detect arrhythmia when taking the blood pressure at the same time, support two way power supply, you can choose 4*AAA dry batteries(batteries are not included) or you can charge by USB cable(optional), energy saving and free you from the operation hassle. Specifications: Material: ABS; Voltage: 3V; Power: 0.01W; Measurement Range: 20mmHg~280mmHg; Accuracy: 3mmHg(0.4kPa); Pulse Range: 40-200 PUL/MIN; Resolution: 1mmHg(0.1kPa); Power: 4*AAA Dry Battery(Batteries are NOT Included) or USB Charging(Plug in); Memory Function: 99 Groups Records; Cuff: Suitable for 22-32cm/8.7-12.6inch Arm Circumference; Main Unit Size: Approx. 7.75*6.8*3cm/3.05x2.67x1.18inch;