Feature: 1. With a temperature sensor, the fan automatically starts to dissipate heat when the motor temperature rises to 40℃. 2. Made of high-quality metal materials, high thermal conductivity and durability. 3. The high-speed fan greatly improves the heat dissipation efficiency of the heat sink. 4. Strong compatibility, suitable for HPI/Axial/Traxxas/Wltoys/Himoto and all other 1/10 RC Model Car. 5. This accessory is small and lightweight, and will not burden your RC car. Specification: Item Type: RC Accessories Name: Alloy Aluminum 540/545/550 Size Motor Heat Sink Radiator with Fan Cooling Head Ventilation Top JST for HSP/HPI/Wltoys/Himoto/Tamiya 1/10 RC Hobby Model Car Material: Aluminum Alloy Applicable Model Ratio: 1/10 Color: Blue, Red, Black, Silver (Optional) Working Voltage: 6 V Fitment: Fit for HPI/Axial/Traxxas/Wltoys/Himoto and all other brands V-1A, 250mA-350mW Video System: NTSC / PAL Antenna: MMCX Size: Approx. 24 x 27mm / 0.9 x 1.1in (L x W), hole: 20 x 20mm / 0.8 x 0.8in Weight: Approx. 2.7 g Package List: 1 x Cooling Fan