The main PROP-M frame was a 4.5 kg (9.9 Lb) squat box (25 cm × 22 cm × 4 cm) with a small protrusion at the center. The frame was supported on two wide flat skis, one extending down from each side elevating the frame slightly above the surface. At the front of the box were obstacle detection bars. The rover was planned to be placed on the surface after landing by a manipulator arm and to move in the field of view of the television cameras and stop to make measurements every 1.5 meters. Due to communication loss it is unknown if PROP-M rover was deployed.