Designed with 20 high-fidelity sounds, this White Noise Machine helps drown out noise and support sound sleep. White noise also mimics the soothing sound baby hears in the womb.The main switch comes with a built-in light source, helping you easily find it at night. Touch the top to turn on the light and long-press to adjust the infinite brightness. It also features three timer options (one hour, three hours and six hours), along with a built-in memory function that retains your last sound and volume settings.