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Assemble video tutorial: https://drive.google.com/open?id=1B5HmsHX5xEal2gut5sB8Gn49v543mzKX Product Parameters: Nominal voltage: DC 5V Current: 0.2A Size: 65*56*9mm Compaitable: Raspberry Pi 4B/3B+/3B/2B+/2B/B Product Performance: Compatible with multiple versions of Raspberry Pi; All GPIO pins are pulled out, So when the Raspberry Pi is being cooled, its development function will not be affected. The cooling fan adopts active cooling mode, the heat can be discharged in time. On the other hand, keep the raspberry pi connection to be convenient. The Expansion board is made of PCB process, it bring the dazzling effect. You could see the LED light from heat sink icon after you finished the installation. The fan adopts active heat dissipation mode, which is better than passive heat dissipation Package Including: 1 * Expansion Board with Fan 4 * Copper column(column double pass M2.5*17mm) 9 * Screw(M2.5*5 countersunk screw)