Enjoy listening to calm and soothing sounds of nature with this awesome aquarium with built-in sound machine, Fall asleep to sounds of Bubbling Brooks, Ocean Waves, Rain Forest, and Thunderstorms while watching beautiful fish swim back and forth gracefully. Today's busy lifestyles can constantly bombard you with stress and tension. In our hectic daily lives filled with work, family activities, and financial challenges, it is important for all of us to have ways of relieving these pressures. Owning an aquarium is not only decorative but it has been proven to provide therapeutic benefits, increasing your overall well-being. Yes, watching an aquarium can significantly reduce your stress levels, just imagine watching tropical fish while listening to sounds of nature, all-the-while reducing your body's reaction to stress while inducing calmness and enhancing positive feelings. Built-in sound machine plays MP3 files loaded onto a micro SDHC flash memory card (included), use the pre-recorded nature sounds or download your own. Connects easily to an iPad, iPhone or Droid Smartphones with auxiliary cable (sold separately) to download additional nature sounds or soothing music. Includes LED lighting and filtration. Aquarium light can be turned on or off for easy night time operation. Available online in 2.5-gallon, 3-gallon, and 3.5-gallon sizes. Filter uses Koller Products XS replacement cartridges, AQ05FC-30, available on Amazon.