This is a dual-fan cooling expansion board for . This expansion board is compatible with all versions of pins, and all pins can be used. All GPIOs are brought out, and the pins are clearly marked, which does not affect development and use while dissipating heat. The fan adopts active cooling installation, and the heat dissipation effect is passive cooling. The LED light and the fan are controlled separately, and the LED light is welded on the back of the board, so it not be dazzling when used at night. With hexagonal copper columns, the height difference between the heat sink and the chip is increased, the negative pressure area is expanded, and the heat dissipation is more effective. The fan can reach a stable working state after running for five minutes. The temperature of the gradually rises after it is turned on, so it does not affect the use at all. Specification Rated voltage VIN: DC 5V Rated current VIN: 0.2A Maximum power: 1W Operating temperature: -10C-50C Size: 65.06x56.05 mm Positioning hole size: 3 mm Colour:black Material:plastic Package Contents: 1 * 4B Radiator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.