Feature: 1. WHITE NOISE: Soothing and even white noise helps to block out high frequency noises, which provides you with a quiet sleep environment. 2. 10 KINDS OF SOUND: Built in 10 kinds of calm white noise sound for you to choose from, effectively improve sleep, relieve fatigue, relax your mind. 3. SIMPLE USE: One button control, convenient and easy to use, suitable for busy parents to start and adjust quickly. 4. LULLABY MUSIC: Built in 2 lullaby, accompany children to sleep peacefully, help promote baby sleep, ensure their healthy growth. 5. AUTOMATIC NOISE DETECTION: Long press for 2 seconds to enter the noise detection, If it detects a continuous noise for 10 seconds, it will start the music itself, it will automatically stop after 15 minutes and enter the detection mode again. Specification: Item Type: White Noise Sound Machine Material: Plastic Product Size: Approx. 9.3 x 8 x 2.8cm / 3.7 x 3.1 x 1.1in Battery Type: Lithium battery 5V300mAh (built in) Usage Time: 23 hours Charging Time: 1 hour. Package List: 1 x White Noise Machine1 x USB Cord 1 x Manual