AquaView 3.5-gallon aquarium kit includes energy-efficient LED lighting with 7 color choices plus 4 transitioning and color combinations you can choose depending on the time of day or to enhance your viewing pleasure along with internal power filter and one year supply (12) of filter cartridges, keeping your aquarium water clean and your fish healthy. Imagine watching beautiful fish swimming gently back and forth, ideal for helping forget about stress in everyday life. People enjoy watching aquariums as they can be calming and relaxing, as well as a beautiful addition to any home or office. Gravel and decor sold separately. Light uses 3 AAA batteries (not included), optional 5V power adapter (AQ51000) enables LED light to be plugged into household electrical outlet. Dimensions: 11.2″ L x 8.8″ W x 13.5″ H.