This is very useful application that let you overclock your Defy’s speed.
So, when it’s needed the speed can be overclocked up to 1.2 GHz ( of course, it depend on your guts ), on the other side, if the screen off or there are no activities in the background you can reduce the processor speed.
VSel 1 = When screen is off
Vsel 2 = When screen is on, but not reach the threshold yet
VSel 3 = When device reach threshold or more.