This is the Hobbywing EZRun MAX10 G2 140 Amp Sensored Brushless Waterproof ESC/3665SD Motor Combo. Using IP67 waterproofing and featuring a smart sensored brushless system this versatile combo is an excellent choice for 1/10th 4X4 Trucks and Monster Trucks. Features: The EzRun Max10 G2 ESC features an improved waterproof sensored cable interface and an upgraded sensored mode to achieve a great sense of control feel and perfectly matches the EzRun 3665 SD G3 motors. Supports Turbo timing adjustment of up to 32 degrees, and in combination with the EzRun 3665 G3, the maximum speed is 25% more with greater effect. The smart start-stop technology is introduced to the Max10 G2 ESC. The frameless fan will not be enabled to reduced noise and saving power. The fan will only work when the temperature rises to a certain level.