d6 black [single camera]] d6 gray [single camera]] d6 orange [single camera]] d6 black [dual camera]] d6 gray [dual camera]] d6 orange [dual camera]] d6 black [optical flow positioning + electrical adjustment dual camera]] d6 gray [optical flow positioning + electrical adjustment dual camera]] d6 orange [optical flow positioning + electrical adjustment dual camera]]

single electric version [five-direction obstacle avoidance]] dual-power version [five-direction obstacle avoidance]] three-level edition [five-direction obstacle avoidance]]