Clear plastic half-moon shaped tank with clear plastic canopy and feeding hole. Repositionable LED light illuminates from either above or below the aquarium. LED onoff switch. We recommend using translucent glass beads if illuminating from the bottom. Holds 1.1 gallons. Requires three AA batteries (not included.) Micro B cable compatible as well (adapter not included.) 9" wide x 10.5" h x 4.5" deep.