I personally love this product.

When my son was born we had alot of problems trying to get him to sleep in his own bed, he liked to sleep right on top of either me or my husband (which I know is very normal). It was not working for us, neither of us were getting any sleep at all.

We knew he loved the sea horse, so we started rocking him to sleep in our arms with the sea horse, and we did this every night for a few weeks and slowly we started to put him in his own bed, for the first few days he would only stay there for about 30 minutes, then he started to stay there for a few hours....and finally he goes right to sleep in his own bed, we just turn the seahorse on and he is out like a light for 6-8 hours.

The battery life is great (using it 4-6 times a day) the batterys last 3 to 4 months.
It has a volume control on the inside, so if it is noisy in the house we can turn it up.
It plays for 5 minutes which seems to be just enough time for him to fall good and asleep.
The songs are sweet....nothing amazing there, normal baby lullabys.
If you press and hold the belly it turns off, and if you press it back on it will start on the song you turned it off on.

I give this two thumbs up!
I would buy this for anyone about to have a baby or anyone that just had a baby.