https://www.cnet.com/news/this-wireless-blood-pressure-monitor-is-just-27-99/

The kit consists of an arm cuff and a rechargeable base station -- good for about 500 uses, according to iHealthLabs -- that's also a stand for your phone or tablet. Once you pair the two, all it takes is one tap in the iHealthLabs app to start a BP test.

I took the Ease for a test drive and found that it worked exactly as advertised. My BP readings were very close to what they were during my last physical. Your mileage may vary, of course, and I will say that the arm-placement diagram on the cuff is a little confusing.