Instruct: Classify Amazon reviews into positive or negative sentiment
Query: MINUS ONE STAR/ DON'T WASTE YOUR MONEY

We were so excited to buy this only to find out you can't hear anything except amplified noise in the room and my pulse. I am 8 months now and this product only made me worry from the minute I tried it when I did not hear either twin's heartbeat at 5 months! I still can't hear anything with it. Even my doctor & nurses say it's a waste of money. A big disappointment / the only thing I used it for is to play music for the babies which I can do with a CD player, headphones & my own classical CD's. If there was a 'no star' rating, this product would take the cake. Save your money & buy something else that will benefit your baby in the long run.