Feature: 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. Specification: Item Type: White Noise Machine Material: ABS Sound Source: Built in 18 sound sources Battery: 18650 lithium battery 1200mah (included) Buttons: 6 sound buttons, each button corresponds to 3 sleep help sound Color: Gray and white Timer Function: 15, 30, 60 minutes Knob: Adjust the volume levels and switch on and off Use Time: 7 days for normal use, about 15 days standby Weight: Approx. 375g / 13oz. Package List: 1 x White Noise Machine1 x USB Cable1 x Manual