biOrb Classic 15 Aquarium with Moonlight LED Light - 4 Gallon Constructed Out of Acrylic- 10 times stronger than glass, 50% lighter and 93% clearer True 5 Stage Filtration - Biological, Mechanical, Chemical, Water Stabilization and Oxygenation Low Voltage  All biOrb aquariums operate from a 12V Transformer LED Lighting  Equipped with a long lasting, low voltage biOrb Moonlight LED Light Filter Cartridge  A true one size fits all filter for the biOrb aquariums