Product Features Double 99 memories, IHB irregular heartbeat detection, WHO blood pressure classification Smart pressure, Voltage power detection Product Specifications Product Dimensions: 77.5mm × 68mm × 30mm (excluding wristband) Storage temperature: -20 ~ 50 degree Storage Humidity: 15% to 90% Operating temperature: 10 ~ 40 degree Operating Humidity: 40% to 85% Display: LCD digital display Measuring method: pulse scanning / oscilloscope assay Measuring range: hypertension / hypotension: 20mmHg ~ 280mmHg Pulse: (40 to 200) beats / min Resolution: 1mmHg (0.1kPa) Accuracy: ± 3mmHg (± 0.4kPa) Pulse: ± 3% of reading within Voltage: 3V Power Consumption: 0.01W Packing information Box volume: 9.2cmX9.7cmX12.2cm, Batteries are not included