This is another case of "you get what you pay for". The good thing is that they don't deceive you by selling something useless at a high price. What problems does it have? The pressure gauge does not have a screw to turn it completely to zero. The wristband is made of such plastic material that you can hear it scratching inside your ear during measurement, and for the same reason, it is a bit difficult to put on because it is stiff. Also, the ventilation screw does not allow you to have complete control over the downward movement of the pressure gauge needle. I had to use my old pressure gauge and the ventilation screw. As for the wristband, nothing could be done because my old one is broken. However, if it is to be used rarely, it is fine. It's just not suitable for everyday morning, noon, and night use.