?Easy to Use and Safety Assurance?The white noise machine has passed FCC, CE and RoHS certification, so there is no need to worry about any accidents about the product. Plug the product into the socket, no need to press the buttons too hard, just press the button gently, ready to go. In addition, we provide 365-day satisfaction purchase guarantee, if the product has quality problems, please contact us for a new one replacement. ?4 Timers and Memory Function ? The sleep sound machine can be set with 1 hour, 2 hours, 3 hours or continuously. You can choose to play the sounds continuously or choose from the auto off Timer. Besides, the previously set volume level, timer and sound will be remembered when next turn on the device again, so you don't have to press buttons all the time. ?36 Adjustable Volume Levels? The sound machine for sleeping offers 36 different volumes that you can easily adjust the levels of volume changes with just a button to meet the needs of a variety of scenes. Simply adjust the volume to cover up conversations, excellently masking background noise and protect your speech privacy in office. Perfect for improving sleep quality, comforting babies, relaxing mood and blocking annoying noise. ?Relax and Unwind?The loud white noise machine can create a comfortable and relaxing environment, it can be used for meditation, yoga, office, or decompress. Moreover, delivers high-fidelity and robust bass through an advanced 5W stereo speaker, you can easily fall asleep and relax outside, ensuring that you and your kids can experience natural, recuperative sleep at home, on vacation and in unfamiliar surroundings. ?32 Non-looping Sounds ? The portable sound machine has white noise, brown noise, pink noise, blue noise, soft noise, rain sounds, 5 fan sounds, 5 lullabies, 3 wave sounds, thunderstorm, heartbeat, fire, bird, meditation, and relaxing natural sounds and so on. The white noise machine can effectively buffers outside noise disruption from loud neighbors, snoring partners, street sound, and chatty coworkers, creat an ideal environment for your better sleep, relaxation and concentration.