Description:It becomes cold or hot in a few minutes (you can choose by switching the polarity). It has a wide range of applications, such as CPU cooling. Must be used in conjunction with the heat sink to avoid burns. Specification:Condition: NewInternal resistance: 2.1-2.5ΩWorking current: 4.3-4.6A (rated voltage is 12V)Rated voltage: 12V (Vmax: 15V starting current 5.8A)Cooling power: Qcmax 55WTemperature range: -55-83°CDimensions (Length x Width x Height): 40 x 40 x 3.75mmPackage list:1*cooling patch Note:1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2.Please allow slight manual measurement deviation for the data.