Features:Compatible with:540 545 550 Size Electric Engine MotorPowered by DC voltage:5VKeep your temperatures in check and your motor running efficient and cool with our heatsink and cooling fan combos.Specification:Part No.: N10105Color: TitaniumCooling fan size:1.55 x 1.55 x 0.45 inch(L x W x H) Whole dimension: 1.8 x 1.58 x 1.68 inch(L x W x H) Weight: 36 gMaterial:Alloy AluminumPerfect fit for RC 1:10 Model Car, easy to install.Package Include: 1x 540 545 550 Size Electric Engine Motor HeatsinkNote:Check your specific model's manual for compatibility,or Contact us.Designed to be powered by DC voltage only between 5.0V and no more than 6.0V MAXIMUM! If you choose to power our cooling fans with voltage exceeding 6.0V you are doing so at your own risk! Please make sure that your power source (battery pack, receiver, etc.) is able to supply consistent voltage no lower than 5.0V and no higher than 6.0V. If powering from an ESC, check with the ESC manufacturer to make sure if your ESC is capable of providing enough auxiliary power to handle the added load of extra cooling fans; some ESCs that have built-in fans may not be able to reliably power any additional cooling fans. 
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