we bought this unit to reassure us during pregnancy after having a lot of trouble in the past ... it's perfect! we began to hear the baby's heart to 10SA and clearly, you just find it! Now we hear his somersaults waiting to feel the move. it's really magical to hear her baby at home with dad without inermédiaire and hyper reassuring because we finally locate the fast even if sometimes the sound is more distant. I recommend this to all future doppler very distressed moms even be aware limited to a few minutes occasionally. it really helps to see the weeks go faster !! the gel is very useful at first, the device easy to use and good quality sound and then you can share it with our family! quickly provide a replacement battery by cons!