30 Comforting Smoothing Sounds:This white noise machine has 30 sounds to choose, basing on your preferences or different surroundings, including 5 white noise, 5 fan sounds, 5 raining sounds, 5 forest sounds, 5 ocean wave sound and 5 heartbeat sound. Non-stop continuous soothing sounds help create an easeful sleeping atmosphere to make your babies off to sleep and save exhausted sleepy moms or dads. 3 Timer Setting Memory Function:There are 3 optional timer Settings of our white noise machine: continuously play and Auto-Off 30 minutes/ 60 minutes Timer. Besides, our white noise machine is equipped with memory function design, which means that it "rememebr" your settings last time, so it will restore previous volume, sound and timer settings automatically. Bright LED Light Work as Night Light:This white noise machine comes with upgraded bright LED light, which can work as night light and is ideal for feeding or nursing in the middle of the night, also makes it easier for you to see your baby. USB Charge and Portable:This baby sleep aid machine is charged through USB cable, you can operate it by plugging into the mains. Please note this sleep aid machine can only work with USB cable plugged in, without cable it couldn't use. It's small and light weight which is extremely convenient when you’re packing around so much stuff whether for a baby or for your travel.