Things You'll Need
Instructions
Insert six AA batteries into the Lego Power Functions battery box.
Plug the gray Lego block on the Power Functions light into the top of the battery box, beside the orange switch.
Incorporate the battery box into your Lego project. Make sure you can still access the orange switch when you finish building. Connect the black block on the light to another part of the project.
Push the orange switch on the battery box to the "On" position. A green LED light will turn on, as well as the LED lights on the Power Functions light.