Does it automatically sync with the app on my phone or do I have to initiate the sync each time?

Hello, this iHealth Track Bluetooth blood pressure monitor is designed to use with or without smartphones. You have to sync by pressing the M button to upload via Bluetooth 4.0 by launching the iHealth Myvitals app.

Where do I get a bigger cuff’s for iHealth?

Hi! For the bicep models the cuff comes in three sizes: • Standard: 8.6 - 11.8 inches • Large: 11.8 - 16.5 inches • XL: 16.5 - 18.9 inches Replacements can be ordered from our site: https://ihealthlabs.com/product/cuff-blood-pressure-dock/ Thank you for your interest in the iHealth products!

Can this bp cuff be calibrated by the user? And does it have a plug in option?

No and no. It has been very accurate. The cuff is easily applied and fits small to large users. Always sit in an upright position with feet flat on the floor and arm at heart level, resting for 5 minutes prior to taking the blood pressure for best results. If not becomes inaccurate, change the batteries first and then call the number provided if that does not correct the problem. I take my blood pressure 1-2 times daily and the batteries have lasted for approximately 9 months since I purchased the cuff.

I have hypotension how low does the bp read and how high does the pulse read? Does the box or book it comes with show any parameters?

Surely all the information is listed in the manual which incl. in the package. I paste those information for your reference in advance, kindly check the content below for this iHealth Track Smart Blood Pressure Monitor : Measurement range: Cuff pressure: 0 - 300mmHg Systolic: 60 - 260mmHg Diastolic: 40 - 199mmHg Pulse rate: 40 - 180 beats/minute Measuring accuracy: Pressure: ±3mmHg, Pulse rate: ±5%