【Rechargeable and Portable】This portable white noise generator is very energy efficient. A single charge provides all-night operation and comes with a USB charging cable. Its lightweight and compact design make it ideal for travel. Timer and Memory Function: Simply press the timer button on the device to set an automatic shut-off time of 30, 60, or 90 minutes, or play all night if needed. It remembers all last used settings, making it easier to fall asleep. 【Volume Adjustment and Headphone Jack】This white noise device has 30 levels of precise volume control, allowing you to gradually adjust to your comfort level. The 3.5mm headphone jack allows you to reduce noise during the day without disturbing those around you. This product is an ideal gift for babies, children, adults, and the elderly. No night light function. 28 Soothing Sounds: This sleep aid offers 28 high-fidelity, non-repeating sound effects (7 white noises, 7 nature sounds, 7 baby soothing sounds, and 7 lullabies). It helps block distracting ambient noise, making it easier for your family to fall asleep. It is also perfect for meditation and sound therapy.