Hobbywing 30401058(BLACK) - Motor XeRun 3652SD G2 3800kV 5mm AxleFull sensored Mode The first 4 pole motor with a built in chip which helps ESC identify it's a HOBBYWING motor (only when pairing it with the XeRun XR8 series of ESCs) and the XR8 ESC create a power system which is able to work in the "sensored" mode (at all times) and provide users with the better performance and smoother control. Note: this motor is compatible with other ESCs but unable to work in the "sensored" mode at all times. ? Turbo Timing