Item Type: RC Cooling Fan Material: Aluminum+Plastic Fan Size: Approx. 30x30x10mm/1.2x1.2x0.4in Suitable Motor Diameter: Approx. 36mm/1.4in Weight: Approx. 48.0g/1.7oz Type: RC Accessories Input Voltage: 5V Input Current: 1.5A Fitment: Fit for 1/12 RC Car Fit for 1/10 RC Car Fit for 540 Brushed Motor Fit for 550 Brushed Motor Fit for 3650 Brushless Motor Fit for 3660 Brushless Motor Fit for 3674 Brushless Motor 1Made of high?quality aluminum and plastic materials, it has high thermal conductivity and durability. 2The heat sink is suitable for 540, 550 and 3650 size motors, equipped with 5V cooling fan to protect the motor. 3The cooling fan can be turned on through the receiver, which is convenient and easy to use. 4The cooling fan is designed for greater heat dissipation and prevents the engine from overheating. 5Use a combination of heat sink and cooling fan to cool, keep the temperature under control, and the equipment runs efficiently. 6Always keep the motor at an appropriate temperature to effectively complete the engine's work.2 x RCCoolingFan 1. Manual measurement, please allow 1?3mm/0.04?0.12in error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. The motor is not included in the delivery.4. The cooling fan can be powered easily from the receiver.5.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.