Package Includes: 1 x White Noise Machine 1 x USB Cable 1 x User Manual Specification: Color: Gray+White Material: Plastic+Electronic Component Input: DC5V 400mA or 4xAA batteries( Battery not included ) Automatic timing selection: 15/30/60 Minutes Package Size: 15x14x4cm/5.9x5.5x1.57 inch Features & 9679; 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. & 9679; Automatic timing selection: 15, 30, 60 minutes. & 9679; Volume control button. & 9679; Good sleep makes you younger and younger. & 9679; Soothe your mood, relieve stress, and promote sleep. & 9679; Light and portable, beautiful sound to let you sleep peacefully. & 9679; Applicable to people who are under pressure to work, people who are usually insomnia, crying baby at night, etc.