Note: Batteries not included.2 Batteries Size AAA are required. Fit Wrist circumference 5.3-8.5 inch Important: -Apply cuff as illustrated in the manual and tighten firmly before starting the reading -Take blood pressure at the same time every day. In the morning shortly after getting up is best -Don't use the monitor in a very cold environment,don't use monitor when you want to discharge urine -Avoid eating, alcohol, smoking, exercising, medications, and bathing for 30 minutes before measuring blood pressure -Rest in a chair for 5 to 10 minutes before taking a reading,don't talking or moving when measuring -Sit in a comfortable position and rest your arm on a table at approximately heart level for the reading -Note that your blood pressure can vary significantly in as little as a few minutes -For maximum accuracy you can use the option to average your last 3 readings Specifications Irregular Heart Beat Detection WHO Classification Indicator Last 3 Results Average mmHg Display: Yes Low Battery Indicator Jumbo Display Memory: 4x30 memories Accuracy: ±3 mmHg (±0.4 KPa) Test Range: 20 mmHg-300 mmHg (2.7 KPa-40 KPa) Pulse Accuracy: ±5? Pulse Test Range: 30-180 Beats/Minute Display: Liquid Crystal Display (LCD),45 x30mm Battery Life: Approximately Two Months @ 3 Times Usage Per Day Dimensions: L3.11xW2.51xH1.14 inch , 7.9x6.4x2.9 CM (L x W x H) Weight: Approximately 120g excluding battery Package include: 1x Blood Pressure Monitor , 1x Carrying case , 1x Instruction manual