I received this for free to try and give my honest opinion. I was excited to receive this noise machine. I have always slept better to the noise of rain and I was happy there was a rain sound. Plus a thunder sound. There is 6 different sounds on this machine. It comes with a charger cord or you can travel with it and use batteries. It also has a timer and a volume setting. I sleep better with this noise machine. [This review was collected as part of a promotion.]