This is the Hobbywing EZRun MAX10 Sensorless Brushless ESC and 3652SL, 4000kV Motor Combo. The Hobbywing EZRun MAX10 Sensorless Brushless ESC uses an advanced Motor Thermal Protection circuit to monitor the motor temperature and protect the motor from irreversible damage due to overheating. Combined this with a high voltage internal BEC, a high quality power switch and the durability that has made Hobbywing famous and you have an excellent choice for powering your vehicle in any sensorless application.