Get ice cold in minutes or heat to boiling by simply reversing the polarity, used for numerous applications from CPU coolers to alternate sources, or even for your own custom car drink /cooler. Since they consit primarily of semiconductor material sandwiched between ceramic plates and have no moving parts Each device is full inspected and tested : TEC1-12706 Size: 40mm x 40mm x 3.8mm Voltage : 12V Umax (V) : 15V (A) : 5.8A QMax (W) : 65W Cord : 300mm Net weight : 22g Color : White Material: Ceramic Installation Cooling piece is very simple to install and . Before installation, to find a dry cell, connected to the two leads of the cooler, obviously cold you can feel at one end and the other end of fever, remember the polarity of the lead and determine a good cooler cold and hot end. If you want to get a bigger system , it is recommended two cooling mode, with two stack up with the above, a grim absorption following a fever, the experiments prove two refrigeration effect is much the single-stage, the condition can three, of course, have a supply support. Package included: 1X 12706 Thermoelectric Cooler Note: heat side requires heat sink all the time. Note:Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/-1-3cm.