Thank you for viewing! This is the LEGO Mindstorms RCX 1.0, included with the Robotics Invention System, Version 1.5. Power-on has been confirmed. There is a spot of liquid leakage in the battery box. The LEGO RCX 1.0 is a programmable robot controller, characterized by its yellow design. - Model: RCX 1.0 - Color: Yellow - Battery Type: AA batteries (1.5V) x 6 - Material: Plastic Thank you for viewing.