24 SOOTHING SOUNDS: Douni white noise sound machine has 24 total sounds in three different categories:7 Fan sounds; 7 White Noise ;10 Classical Nature Sounds including Ocean Waves,Forest, Thunder ,Brook, Crickets, Train, Clock Ticking,Campfire ,Lullaby and Fetal Tone suitable for soothing your little one , your older kids into a deep,restful sleep. Simply to plug in to use this sound machine. AESTHETICALLY PLEASING & PORTABLE SIZE: Featuring stylish wood grain finish, this sound machine matches any decor at nursery room ; office; bedroom; hotel room; kidโ€™s room perfectly. This portable sound machine Weighing 9.7 ouces and measuring 2.3 inches high; this fits easily into your backpack or suitcase and makes it great for travel or in-office use to relieve anxiety and sleep better . TIMER OPINION and MEMORY FUNCTION: The sleep sound machine features a 30, 60 or 90-minute sleep timer, The sleep machine can either play all night or automatically turns off when you want it to.whether you are taking nap, relaxation, meditation or concentration while studying or working. The sound machine remembers your last settings of the timer, sound, and volume level when you next turn it on.