5pcs TES1-4903 20x20x3.6mm 5V 3A Thermoelectric Cooler Semiconductor Refrigeration Film Heatsink Peltier Plate ModuleDescription: Note for use in refrigeration: 1. The red wire is connected to the power wire is connected to the anode, cathode, and without cooling conditions, the instantaneous power of the test, which touch the two end of the refrigerator, you will feel a fever, a little have a fever cold, heat, cold side cold. But time can not exceed 5 seconds, otherwise the hot end temperature is too high, extremely easy to cause the device to burn out. 2. Under