Fischertechnik-Computing-Robo-TX-Explorer-Construction-Kit-Fischertechnik-508778-P-With-the-ROBO-TX-Explorer-you-can-explore-unknown-areas-measure-distances-follow-tracks-show-the-direction-you-are-going-with-indicator-signals-detect-colours-measure-temperatures-avoid-obstacles-without-touching-them-differentiate-between-day-&-night-automatically-switch-headlights-on-&-off-trigger-alarms-&-much-more-Two-encoder-motors-allow-the-caterpillar-tracks-to-be-controlled-separately-o