Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sleep sheep

I love that this is a portable sound machine. I can strap it on my son's car seat and take it anywhere. The 45 minute timer is also a great feature. Most noise machines out there shut off after only 10-15 minutes...right about when my son is just drifting off, and the change in sound wakes him up. The noise device can be removed and you are left with a cute stuffed toy. I highly recommend this product.