At first we thought that the gift is somehow moronic. Finally, it has given me security but then in the worst moment of my life, when I had a fall bleeding after 39 weeks of gestation. As if in a trance we called the emergency services at (who had nothing in the rest in order to be able to tell me whether my child lives) and I would certainly become totally panicked, I could not hear her heart beating. What I loved in these minutes my line to my little mouse. While everyone else was panicking, I listened to the heart of my little daughter at the throbbing and knew that everything will be fine. And it was of course! For me it was worth gold! 6 stars!