Traxxas Velineon VXL-3s Accessory Cooling Fan reduces ESC temperatures during extended operation for maximum power flow. It securely clips onto the VXL-3s heatsink for easy installation. Wires are neatly routed thanks to the integrated connector clip. Simply plug the accessory cooling fan into the Velineon VXL-3s accessory power connector and clip the fan onto the heatsink for increased cooling