SMART MANAGEMENT - Bluetooth connectivity lets you store and track all your readings in the Dario App. Easily share with your doctor or loved ones. ACCURATE FDA Cleared, FSA & HSA Eligible. Accuracy of Pressure: ±3 mmHg or ±2% of reading. Accuracy of Pulse rate: ±4% of reading. LARGE MEMORY - Blood pressure meter saves up to 400 memory records with dates and times, and the app has unlimited readings. Dual User Mode enables you to store measurements for 2 people (only on the device). DETECTS IHB - Detects Irregular Heartbeat / arrhythmia. Please note that the device does not replace a cardiac examination but serves to detect pulse irregularities at an early stage. PORTABLE Comes with a carry bag and batteries, ensuring a long battery life. Please note there NO A/C Adapter required.