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 / 13oz