Take and track your blood pressure and heart rate with the Wireless Blood Pressure Monitor by Nokia. It is easy to operate, highly accurate, and automatically sends all data to your smartphone. iOS compatibility (iOS 8 and higher)-iPhone 4S and more recent, iPod touch 5th generation and more recent, iPad 3rd generation and more recent. Measurement range- 0 to 285 mmHg. Accuracy: ±3 mmHg or 2% of reading. Heart rate- Measurement range: from 40 to 180 beats per minute. Accuracy: 5% of reading. Atmospheric conditions. Operating temperature: from 10°C to 40°C 15 to 90% RH. Storage temperature: -20 to 60°C 10 to 95% RH.