I’ve used this noise machine for over six months now! We take any time we travel with our son, it’s small and lightweight. There are three types of noises it makes and tons of room for louder or quieter volume plus the power switch. Took me a few tries with the 3 second power up, but after those few times I got the hang of it. My kids are able to turn it on when their baby brother naps and it helps him sleep longer. We’ve become so accustomed to the sound machine that if it ever dies in the middle of the night, I quickly plug it in and it turns right on(no waiting for it to recharge to work). It came with a power usb cord that I plug into my iPhone charging port. Works for hours before dying if not plugged in. Great for blocking out noise, we are so happy with this purchase.