It's a hand help unit made by Superchips. It's plugged into the cars OBD port, and will replace the OEM map with a Superchips map. Because it's a portable handheld devise the remap is reversible at any time, meaning the map can be returned to normal before a service etc.
I have looked into this for the Cooper, and have decided again and again that it's not worth it. The official increase is 8bhp, which for the price isn't a lot. Certainly not worth replacing my JCW map for. It's an instant kick in the pants for the ONE, which as mentioned is a de tuned Cooper, but for the other models I wouldn't bother. There are not many people around that have one on their Coopers.
Its also the case that unless you drive it at more than 4000 rpm you wont notice the difference.
Seperate question >>>>do the ONE ( without ECU re map )and Cooper respond in the same way below 40000.?
In other words do you need to drive a cooper at or above 4000 rpm to feel a difference between it and a ONE