My aunt asked me - via the Internet - to buy a blood pressure monitor. As Amazon customer was clear to me from whom I buy the device. I ordered og sphygmomanometer. After two days I was in possession of the device. The demonstration with my aunt was done in half an hour. My aunt was able to perform the blood pressure measurement without my help. From the announcement of the measurements over sound She was enthusiastic. The description indicates that this is an excellent device. I would highly recommend to anyone who needs to measure his blood pressure is with a clear conscience.