From the product description
It comes with two touch sensors that look like insect antennas, and when they detect an obstacle, the Scarab will first step back and then automatically execute a two-step maneuver to avoid the obstacle. The maneuver is a combination of "left turn", "right turn", "reverse" or "stop". The Scarab Robot can be configured with different sets of movements. Easy assembly allows you to learn electronics, robotics and mechanical design. The kit comes complete with 2 sets of differently designed legs, which move in their own distinct way.
Here is the link for the Scarab Beetle Robot Kit