The Graco SweetSlumber sound machine lulls your baby to sleep. It plays 12 different soothing sounds including white noise, lullabies and nature sounds to soothe and calm your tot. This sound machine has an MP3 plug-in that allows you to queue up your tots favorite songs from your music device. The built-in timer shuts down the unit after a preset time. This sound machine comes with a nightlight that creates a cozy atmosphere. It has a small footprint to save table space and can be easily packed while traveling. This baby sound machine works on AC power supply and can also be powered by 4 AA batteries.