High fidelity and loop-free 20 soothing sounds - White noise machine has 3 white noise, 3 fan sounds, 3 rain sounds, 3 ocean wave sounds, 2 lullabies, water flow, campfire, bird, cricket, ticking sound, heartbeat. Choose the perfect channel and get ready for your personalized sleep therapy Warm Night Light Guards Baby's Sweet Dreams - This sound machine comes with an optional night light that provides a good sense of security and allows baby to fall asleep naturally. Auto-off Timer Comments - The sound machine allows you to set optional 15, 30, and 60-minute auto-off timers without having to get up to turn off the device or leave it playing all night. Easy to use and memory function - Whether you are taking a nap, relaxing, meditating or when you are concentrating while studying or working, the next time you turn on the speaker, the speaker will remember the sound and volume level you last set. BATTERY OPENED AND PORTABLE - This white noise speaker comes with a 1200hAm battery that lasts for 30 hours on a full charge. It is small, lightweight and easy to carry, suitable for office and travel use. It easily fits into your purse, bag, or suitcase and can be easily taken with you wherever you go, and you no longer have to worry about sleeping in an unfamiliar environment.