[Product Overview] Name: USB light building block aquarium Material: acrylic, plastic Size: length 120mm, width 80mm, height 105mm Color: black, white, transparent Features: freely combinable Instruction manual Usage Squeeze the transparent inner tank together with one hand and the outer frame with the other and pull it in the opposite direction. You can open the aquarium. Arrange the landscaping in the aquarium, add water and put fish and shrimp in it. Put on the outer cover. Slightly press the outer cover, and the outer cover will be deformed, while the inner cylinder will be very rich