Get ice cold in minutes or heat to boiling by simply reversing the polarity, used for many applications from CPU coolers to alternative power supplies, or even for your own custom car water cooling heater/cooler. As they mostly consist of a semiconductor material sandwiched between ceramic plates and have no moving parts Each unit is completely inspected and tested Model: TEC1-12706 Size: 40mm x 40mm x 3.8mm Voltage: 12V Umax (V): 15V Imax (A): 5.8A Qmax (W): 65W Power Cord: 2mm Net Weight: 2mm C: 2mm Net Weight: 2mm The cooling bit is very easy to install and use. Before installation, to find a dry cell, connected to the two wires of the cooler, obviously cold you can feel at one end and the other end of fever, remember the polarity of the wire and determine a good cooler cold and hot end. If you want to get a larger system, it is recommended to two cooling modes, with two stacked up with the above, a gloomy absorption after fever, experiments show that two cooling effects are much better than single-stage, the condition can choose three, of course, has a large power consumption. Package Included: 4 x 12706 Thermoelectric Cooler Note: The hot side requires a heatsink at all times. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.