From the 14th week available with us, loudspeakers used to, is serving

We have purchased the product by 2 FG in the 12th week of pregnancy in order to reduce the panic between medical appointments can. Contrary to some reviews concerning. The very early functioning, it took us a little longer. In the 12th and 13th SSW (the child grows up to now to the day "right" so is not too small, etc.) could not yet find / identify the baby's heartbeat. This works only since the 14th week of pregnancy, since the 15th SSW also without a long search.
We use the device very dosed and not every day - in "panic moments" it fulfilled but now finally 100% its purpose. However, it would have been nice if it had already worked before.
Apart from that the probe cable is not very firm, and the speaker is a bit strange, which is why we have joined its own.