Since I have no clue where the baby could be because I still do not have a baby bump, I for the first time abandoned after 5 minutes. After an hour I got it again tries. Constantly a heart belongs, compared to my pulse and it was always my heart. But after 10 minutes I heard a very faint heartbeat that goes about twice as fast as my own heart.
I had to keep a slight angle the device but. So when I would try to get under my pubic bone to the sound. Is difficult!
But listening to the heart then gives power to endure all the health problems.
However, I have to say that it can be addictive. I would prefer to directly hear every day a look. But should not be so good for the child. One should discipline something.