The Conair sound therapy machine is designed to give you a peaceful night"s sleep and reduce the intensity of noise from outside. This battery-powered sound machine has 10 different soothing sounds to choose from: waterfall, brook, bird, rain, ocean, rainforest, white noise, heartbeat, summer night and thunder. The sound sleep machine has volume control and can be set to automatically turn off after a set time. It also comes with a power adapter. The compact size makes this sound machine ideal for use at home or while traveling.