22 soothing sound effects: 8 white noises (hair dryer, fan, vacuum cleaner, pink noise, etc.), 8 natural sound effects (dripping water, campfire, birdsong, flowing water, etc.), and 6 lullabies to help infants and toddlers relax and sleep better. This white noise sleep aid features 3 brightness levels and a breathing light function. An adjustable night light makes breastfeeding and nighttime feedings easier. The white noise machine has a 30, 60, or 90-minute timer function to help you fall asleep peacefully. A memory function automatically remembers your previous volume and sound settings. Adjustable volume: You can adjust the volume as needed. This baby white noise machine is equipped with a child lock to prevent children from accidentally adjusting the volume, sound, or light. Bluetooth connectivity: Wirelessly connect to your phone to play your favorite songs. This portable speaker has a built-in 1800mAh battery, providing up to 20 hours of playback time, and comes with a USB charging cable for easy charging.