The Sharper Image Digital Tranquility Sound Soother Sound and White Noise machine helps to improve sleep, relieve stress and increase your focus. The Sound Soother Sound Machine has backlit buttons with an adjustable brightness. The sleep mode will gradually lower the volume during the last 10 minutes of any program. The Sound Soother Sound Machine has a built-in speaker and also features an audio-out headphone jack for private listening. Runs on the included A/C adapter and also features a battery backup. Included with this special bundle are a pair of Air TranSAT earbud headphone headsets for private listening. They feature a 4 foot (48 inches) long cord and removable cushions. Great for private listening.