[7] Tesla upgraded its sensors and software in October 2016 ("HW2") to support full self-driving in the future.[6][8] HW2 includes eight cameras, twelve ultrasonic sensors, and forward-facing radar.[6][8] HW2.5 was released in mid-2017, and it upgraded HW2 with a second graphics process unit (GPU) and, for the Model 3 only, a driver-facing camera .