Safety Assurance & Included The white noise machine has passed FCC, CE and RoHS certification, so there is no need to worry about any accidents about the product; there is a 12-month warranty since the purchase, adapter and USB are included. If you have any questions, please feel free to contact us.Lightweight, Portable and Easy to Use The design of the device is simple and intuitive, light and easy to carry, and the design of large enough buttons allows you to easily change the track, turn on/off the night light, change the color of the ambient light, and even set the timer setting within a few seconds.Humanized Memory DesignThe machine has a unique memory function. The settings in each sound category will be memorized separately, and settings for volume, track and timer can be remembered. It can be used for office, sleep and parent-child interaction, etc.25 High-fidelity Soothing SoundsThere are 4 sound categories, 5 white noises (Soft, Brown, Pink, Blue, White Noise), 5 fan sounds (Soft, 2*Household, Industrial, Lound), 5 Light music (3*Lullabies, Meditation) and 10 natural sounds (Fire, WaterDrop, Rain Thunder, Wave ) and so on. The sound rhythm helps you fall asleep, and the white noise machine can effectively cover up destructive or startling sounds to protect your sleep quality.5 Timer SettingsThere are 5 timer options, continuously play, 1 hour, 2 hours, 3 hours and 4 hours, you can set it according to your needs. When turned off automatically, the sound will gradually fade out and then turn off without waking you up in your sleep.