This is such a wonderful item. What an amazing gift, the gift of peace of mind! I actually had a stethoscope I used when I was carrying my children, however finding the heartbeat can be difficult, only one can listen and its not very loud. I ordered this for my daughter. I am so excited that they both can listen to the baby at the same time. I tested it out first and it works great, IF you turn the volume up. Initially I did not have the volume up and was very disappointed, once I found that it needed to be turn up, I was amazed how clearly you can hear a heartbeat. The instructions also recommends that you use a conduit, like coconut oil, olive oil etc. which also helps the sound to travel better. I love that there is a cord that connects to your phone so you can play music and more to your unborn baby. I was told of someone who recorded the baby's heartbeat on a recording device used to be placed inside stuff animals that you build and had one made for each of their children. How precious to be able to save your baby's heartbeat like that, this would make that very easy to do. Awesome product! Love it!