Plug in to use: Come with 59in DC adapter, long enough. Battery just memory all the settings, the display will go blank and alarm will not sound.8 Soft Nightlight: Come with extra all color cycling, like soothing "rainbow", never bother sleep. Let out gentle and calming glow light, creating a relaxing and sleeping-friendly ambiance, make you and your baby sleep soothing.Small Bedside Alarm Clock: Optional 6 nature sounds of alarm, wake up with good mood. Perfect for blending in with modern home decor, stylish pieces for the bedroom.Auto-Dim alarm clock and sound machine with night light combination device. Upgraded driver offer 30-level volume settings for precise control, helps block disruptive ambient noise to sleep comfortable and peaceful. Wake up with gentle nature sounds.Sleeping Better with 20 Soothing Sounds: In addition to the regular white noise, fan sound, lullaby and nature sounds(bird, ocean, summer night, thunderstorm, rain...), we have added yoga and meditation music to the latest upgrade. Fall asleep to your favorite sound, it will auto-off at your scheduled time (15 to 120 minutes or keep playing).Auto Brightness Adjusts to Any Lighting: Led digital display use an ambient light sensor to adjust brightness levels based on the light conditions around your nightstand. You can customize 0-100% brightness after turning off auto-dimmer.