kids review: This is a battery box for Lego Power Functions, there is a screw on the bottom (takes 6 AAA [1.5V] alkaline batteries), a power button and a switch ( if Revain allows you to comment on reviews, let me know what this toggle does). other kits that I do not own and therefore cannot elaborate on. However, many Power Functions compatible Lego sets come with parts, and those that do not have serial numbers for the Power Functions parts needed to motorize and have installation instructions on the back. Insert batteries, press green button. Power button and you're good to go! Great product for anyone with a Lego set that can house this Power Functions piece.
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