1This thermoelectric cooler uses 12715 refrigeration module which has better cooling effect 2Cooling block has large area that can contact more air for quick cooling 3Four hollow copper pipes with refrigerant inside would deliver heat fast for higher cooling efficiency 4It can be used to make small fridge, mini air conditioner or cooling device for pet 5Tested 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*12cmFan Size: 6*6cmPower: 180WPower 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