This thermoelectric cooler uses high-end refrigeration modules with high power and good durability 2 The cooling block has a large area and can contact more water for rapid cooling 3 Four hollow copper tubes are filled with refrigerant inside for rapid heat transfer and cooling Higher efficiency 4120W, suitable for 30L fish tanks, power 180W, suitable for 40L fish tanks 5 Energy saving, beneficial to the growth and reproduction of ornamental fish Features: This thermoelectric cooler uses high-end refrigeration modules, with high power and good durability. The cooling block has a large area and can contact more water for rapid cooling. Four hollow copper tubes, filled with refrigerant inside, conduct heat quickly and have higher cooling efficiency. 120W is suitable for 30L fish tanks, and 180W is suitable for 40L fish tanks. Save energy and facilitate the growth and reproduction of ornamental fish. Specifications: Power: 120W, 180W (optional) Voltage: DC 12V Current: 10A (120W), 15A (180W) Water inlet/outlet external diameter: 8mm/0.31 inches Dimensions: 143*96*162mm/5.62* 3.77*6.37 inches Package Included: 1 x Thermoelectric Cooler