1,Working Principle: The white noise baby machine eliminates noises that may disturb or distract, thus improving sleep and sooth effect. 2,18 Sleeping Assistant Sounds: White noise baby sound machine can be adjusted by volume control button, USB data cable for charging, 18 sleeping assistant sounds. 3,Automatic Off Timer: The white noise sound machine has an automatic off timer with 3 timers, 15, 30 or 60 minutes. 4,Sleep Assist Effect: The white noise baby machine adds these rhythmic sounds to your baby's sleep process to help them fall asleep faster. 5,Small and Portable: This white noise machine is portable, lightweight and compact, and can easily fit in your bag or suitcase. 1 x White Noise Machine1 x USB Cable1 x Manual Item Type: White Noise MachineMaterial: ABSSound Source: Built in 18 sound sources Battery: 18650 lithium battery 1200mah (included)Buttons: 6 sound buttons, each button corresponds to 3 sleep help soundColor: Gray and whiteTimer Function: 15, 30, 60 minutesKnob: Adjust the volume levels and switch on and offUse Time: 7 days for normal use, about 15 days standbyWeight: Approx. 375g or 13oz Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. YJL official store