9628 Power Add-On Set is an add-on set to the 9632 Science & Technology Base Set. Using the battery box, the motor brings the models to life. The motor can be turned on/off either clockwise or counter-clockwise, and its direction of rotation can be changed. Combine the 9632 Base Set and the 2009628 Activity Pack to carry out 4 new lesson plans, build 4 new models and solve 2 additional problem-solving tasks. Key Learning Values: Brick Type: LEGO® System Related Products: 2009628, 9632