Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Difficult to use!

The product description stated, "Manual blood pressure monitor is the simplest way to take blood pressure readings at home." So I did not get the self inflating model. I pump the bulb as stated in the directions (I follow the directions exactly). It takes many attempts before I get a reading. And I wait the required time before a new attempt. Even though I do exactly the same thing sometimes I get a EE (underinflated) and sometimes I get an E (overinflated). By the time I get a reading I don't know if I have high blood pressure because I have high blood pressure or because I am totally frustrated.