A new evolutionary range within the Erector® product universe. A special fastening system allows for very rapid assembly of projects and all components are compatible with classic Erector® sets. Most sets come with a special power tool that not only speeds up the process of putting all the pieces together, but also doubles as a power source for whatever is being built. Speed Play™ is faster, easier and extends the creative fun of the Erector® product line. Features include fully compatible with classic Erector® computer interactive; includes electronics module & USB cable, download optional movements, sound and music from speed-play. Quick & easy assembly, includes power tool that powers the model plus 2 additional motors, sound and lights. Makes 3 different models: Robot, Crane, 3-Wheeler.600+ parts. Erector sets only get better from the time you played with your first set. You will enjoy using this newly improved set with your child (or grandchild). Excellent for classroom also.