Features: brand new and high quality This RC motor heatsink is specially designed for 4268-4274 motors of RC model car. The RC heatsink with thermal sensor is equipped with 5-10V cooling fan to protect your motor. The thermal sensor will accurately detect risingtemperature, when the motor is up to 40, the cooling fan will automatically turn on to cool the motor. The cooling fan can be powered up from the receiver, convenient and easy to use. With high quality alloy material designed clamp shape andexquisite workmanship, the heatsink is durable for long term use. Specifications: Material: Alloy Color: Black/Silver/Red/Blue Size: Approx. 40x40 mm/ 1.57x1.57 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Alloy Clamp Heatsink