CUSTOMIZABLE VOLUME & TIMER SETTINGThis sound machine for sleep adjusts the sound level with a knob, which effectively cancels distracting noises and protects privacy through precise volume control. Meanwhile, the portable sound machine can be set for 30, 60 or 90 minutes auto shut-off timer.20 SOOTHING 3D SLEEP SOUNDSOur white noise machine offers 20 sleep sounds including 3 noises (White Noise, Brown Noise, Pink Noise), 2 bells (Pendulum, BEN-Ringing), 12 nature sounds (Rain, Thunderstorm, Ocean, Brook, Bird, Mountain Spring, Summer Night, Campfire, Water Drop, Wind & Snow, Heartbeat, Train ), and 3 sleep music options (Lullaby, 2 Light Musics). These sleep sounds therapy the body and mind, relieve stress, and make it easy to fall asleep.Thoughtful Gift ChoiceThis white noise machine enhances relaxation and well-being, making it a great gift for anyone who struggles with sleep. Its user-friendly design is suitable for all ages, making it an ideal gift choice for Thanksgiving Day, Christmas, birthdays, and special occasions.EASY TO CONTROL & COMPACT DESIGNEffortlessly control power, sound, timer, and volume with dedicated buttons and a knob. Compactly sized at 3.8 x 2.8 x 4.2 inches, this lightweight design makes the noise machine an ideal companion for home, office, or travel, ensuring you can enjoy sleep sounds for deep restful sleep wherever you go.LONG BATTERY LIFE & MEMORY FUNCTIONEquipped with a powerful 1500mAh rechargeable battery, our battery operated sound machine offers 18-48 hours of continuous play without needing to be plugged in, making it perfect for travel. The memory function remembers your last sound, volume, and timer settings, providing a seamless experience every time you use it.GENTLE SLEEP TRANSITIONDesigned with your comfort in mind, sleep sound machine for adults gradually fades the sound to silence before shutting off, preventing any sudden interruptions that could disrupt your sleep. Soft indicator lights guide you through the settings without beeping, ensuring a tranquil environment for uninterrupted rest.