This ATTE is fully motorized.Walking, articulation, gun elevation, gun rotation.Please note that you will need at least one IR controller as well.There is a version of the instructions with a Buwizz brick as well hereThe walking mechanism is very delicate. The legs need to be lined up perfectly for the ATTE to walk smoothly and save the gears. Switching between going forward and backward to often will not be appriciated by the model.You can build the model without, but if you do not want to re-assemble often it is adviced to use instant glue at four places as indicated in the instructions.Notice - 4515 parts must be 1x 4515pb023 and 1x 4515pb024- 2362 trans black must be 1x 2362pb12 and 1x 2362pb13- 2362 light gray must be 1x 2362pb14 and 1x 2362pb15- 14769 must be 2x 14769pb014Check out my INSTAGRAM for more detailsIf you want to buy just the instructions, you can find them here.Designer's Social Media:https://www.instagram.com/jbb_777/