ABOUT US: Our electronic upper arm blood pressure monitor has advanced measurement techniques,along with World Health Organisation (WHO) Blood Pressure Classification Indicator to give you the most accurate reading, which is essential to manage high blood pressure.Powered by 4 x AA batteries (included) TWO USERS: It supports two user mode, can store up to 198 sets of data (99 readings for each user). Automatically displays the average of your last 3 readings. Helps users to easily track their health, blood pressure and heart rate according to the specific time and date. FULLY AUTOMATIC: One button operation.Wrap the cuff around your upper arm, assume proper sitting position,get your Systolic, Diastolic blood pressure and Pulse results with one touch of the button.Displayed measurements include: systolic pressure, diastolic pressure, pulse rate, date, time, and user ID. NOTE: Please read the fourth picture and refer to the right posture and steps before taking a measurement.The blood pressure is different throughout the day due to weather, emotion, exercise and other various factors. For maximum accuracy, suggest you to check the average of your last 3 readings(Automatically). PACKAGE CONTENT & AFTER-SALE: 1 x Home Use Blood Pressure Monitor, 1 x Cuff, 4 x AA Batteries, 1 x Instruction Manual. If you have any problems, please contact us. We will address your issue as soon as possible.