Fraud
Apple has NO sensors, neither on the phone nor on the watches that can measure blood pressure! It is NOT possible to do it accurately with the camera and the light on the phone. Try searching on YouTube if you don't believe me. DO NOT BUY THIS APP, buy yourself a REAL blood pressure monitor with BLUETOOTH connection to the HEALTH APP or your own app that then transfers, then you will get something that works, and something your doctor takes seriously.