At nap time or nighttime, this audio machine will help keep your baby fall and stay asleep. A sleeping baby means more sleep for the whole family :) There are 16 soothing sounds to choose from (from chirping of insects and birds, forest, ocean waves, water flowing in the valley, and a sudden rain... + 6 white noises, 4 lullabies, and nature sounds). The white noise machine can effectively mask disturbing or frightening sounds and protect sleep quality. Some of the models come with a night light, and timer.