Overview: 9 kinds of white noise: rain, sea, thunder, wind, running water, light music, guqin, sky sound, prenatal music Automatic timing options: 15, 30, 60 minutes Volume control knob Lightweight and portable, carry it with you Beautiful voice makes you fall asleep High-fidelity music chip to ensure the purity of sound Built-in high-energy lithium battery, long-lasting Soft indicator light creates a comfortable and relaxing atmosphere Special timers provide users with the control of timing and enjoyment. You can choose the working time of 15min, 30min, 60min, and when to automatically shut down Lightweight and portable design, provide portable enjoyment for home, office, travel, suitable for daycare center, university dormitory, apartment, hotel, office, a family bedroom and other environments. Specification: 4-AA battery Voltage: 5VDC 300mA Rated power 1.5w Box size: 16.5x16x6.3cm European environmental standards: ROHS Package Content: Gray card color box packaging 1 USB cable delivered