Bad Robot in my Closet

Is this the end of our world? Will the large robots take  over?  Or will the small robot save us.
David finds a box on the path going to school;  his teacher confiscates it. A small robot turns up at his home and asks for the box. He finds out that Aliens can control the large robots with this device and it might be a chance  to win the war and save the humans before the large robots .The war had been going on for five years. It started when David was thirteen and  he had been hiding and fighting with the resistance since. The robots appeared to be learning and became very clever.They were a lot smarter than they used to be, and they are harder to kill. It took a large group to succeed, and without a group, it was foolish to try to take them out. It was the youth who formed a militia and the resistance.

There were killer robots in The United Kingdom, Germany, Russia, China and Japan. 

But for the first time, the robots had an enemy that could defeat them; aliens!
This is an exciting story the boys for 10-14 years . It is like a kids Teminator story.