Genuine OEM replacement controllers for the Bafang Ultra M620 / G510 mid-drive motor. Choose your voltage (48V or 52V) and communication protocol (UART or CAN / CANBUS) to match your motor. All controllers are brand new, rated 30A / ~1000W (1500W max), and ship fast from Hi Power Cycles. Not sure which you need? UART controllers sync with a C961 display; CANBUS controllers sync with Bafang's BESST software.