I get so worried about the baby & since I can't see or feel the baby yet I went to Babies R Us and bought this lovely monitor so that I could here the baby's heartbeat when ever I wanted too. It doesn't sound like the Doppler at the doctors; it sounds more like a faint drum. The book that came with it says that the further along I get the louder it will get so that is awesome too. I felt so much relief last night sitting there listening to our Love Bug's heart beating away.....until he/she would move & I would lose it for a minute. I am thrilled that DH & I can listen to our baby's heart beat whenever we feel like it!!