The SM23165MT-IP65 with optional IP67 is a NEMA 23 size SmartMotor™ is an entire servo control system built inside of a servo motor. This motor includes an integrated motor, controller, amplifier, encoder and communications bus. SmartMotors™ are true servo motors, which eliminates issues like error accumulation and missing steps found in traditional stepper motors. The M-style connectors offers the same IP65 ratings with the added convenience of a smaller frame size for more compact applications.