Bulky item information

Assemble a smart robotic crab which could detect the edges of any platform and make swift turns to avoid falling off. Turn it on and put in on the table and watch it perform stunning acrobats. Watch out!
Contains 8 legs, 1 transparent cover, 1 chassis with motor installed, 1 washer screw, 2 screws, 1 battery case, 2 claws, 2 axles, 2 gears, 1 metal wire antenna, 2 terminal caps. Also required but not included: 1 x 1.5V "AA" battery and small crosshead screwdriver.