I was so fascinated by this robot designed by NASA scientist Mark Tilden ,I saw it at an estate sale ,and thought I would buy it for my son.It has batteries in the feet and at the back.It works at times but i suspect the button that says on and off is worn out.When you keep the button in manually it starts responding.I managed to open and close the hands,make it walk a bit ,but I can’t keep it to keep doing the same actions and it might need batteries and I don’t have the manual .I think it’s really cool and someone with the right knowledge would probably know how to fix it .It is 34 cm in height and fairly heavy.I don’t mind packaging and posting at the buyers expense,it will have to go in a big box or if you want it can be picked up in Pukekohe.Just to be clear it is not working properly.