The problems that Leo raised are real but need not impede the use of these transmitters in this situation.

1. 'the TX's of toy cars are very weak, so it only requires a little obstruction and your robot is dead in the water'

Given that the box is only 2 metres on a side it should not be hard to get a line of sight to the robot.

2. 'Toy car TX's are made with a limited amount different frequencies. 27.125 being by far the most used one. That means you almost never get to be able to fight another robot made of a toy car because there are pretty much guaranteed to interfere.'

True enough but remember this is about making it easy for beginners to get into our sport. They are likely to be in a small minority and so we can just match them up against machines controlled by 2.4 GHz. And although 27.145 (Yellow) is the most common band, many toy cars are on one of four 27 MHz bands [A,B,C or D], so it might even be possible to have two or more competing against each other.