Package Includes:1 x White Noise Machine1 x USB Cable1 x User ManualSpecification:Color: Gray+WhiteMaterial: Plastic+Electronic ComponentInput: DC5V 400mA or 4xAA batteries( Battery not included )Automatic timing selection: 15/30/60 MinutesPackage Size: 15x14x4cm/5.9x5.5x1.57 inchFeatures 15 white noises: ocean, thunder, soothing music, wind, brook, old lute, rain, sound of nature, prenatal education music, ambience, bird, relax, summer night, forest, meditate, motor. Automatic timing selection: 15, 30, 60 minutes. Volume control button. sleep makes you younger and younger. Soothe your mood, relieve stress, and promote sleep. Light and portable, beautiful sound to let you sleep peacefully. Applicable to people who are under pressure to work, people who are usually insomnia, crying baby at night, etc.