Specifications : Measuring range: Pressure: 30 to 280 mmHg (in 1 mmHg increment) , Pulse: 40 to 199 beat/minute , Static accuracy: Pressure: +3mmHg Pulse: +5% of reading , Measuring resolution: 1mmHg , Rated Power: Input AC200V-50/60Hz Output DC6V , Power: 1.5V AAA size batteries 4 (Alkaline batteries) , Operation temperature: 5~40°C/41-104°F , Operation Humidity: 15%-85%RH maximum , Storage temperature: -20~+55°C/-4~ +131°F , Storage humidity: 10%~95%RH maximum , Dimensions: 173x91x49-1.0 mm , Weight: 425g+5g (including batteries and cuff) , Cuff pressure display range: 0-290mmHg/0-38.7kPa .