1、This thermoelectric cooler uses 12715 refrigeration module which has better cooling effect 2、Cooling block has large area that can contact more air for quick cooling 3、Four hollow copper pipes with refrigerant inside would deliver heat fast for higher cooling efficiency 4、It can be used to make small fridge, mini air conditioner or cooling device for pet 5、Tested with a 10L foam box that 23℃ can drop to 0.6℃ in half an hour, minimum to -2℃ Features: This thermoelectric cooler uses 12715 refrigeration module which has better  cooling effect. Cooling block has large area that can contact more air for quick cooling. Four hollow copper pipes with refrigerant inside would deliver heat fast for higher cooling efficiency. It can be used to make small fridge, mini air conditioner or cooling device for pet. Tested with a 10L foam box that 23℃ can drop to 0.6℃ in half an hour, minimum to -2℃. Specifications: Cooler Size: 12* 19.5*12cm Fan Size: 6*6cm Power: 180W Power Supply: DC12V, 20A (not included) Max. Cooling Volume: 20L (5 to 8℃ lower than room temperature) Weight: 840g(approx.) Package Includes: 1 x Thermoelectric Cooler