Moving in for a closer look we see that the Challenger Pro has buttons along the left side T1-T5 and along the right hand side T6-T10 designated for macro programming.
Macro buttons on the left side
Macro buttons on the right side
Towards the top of the Challenger Pro are two circular rubber covers which pop off to reveal a socket. Bundled with the keyboard you may have noticed the inclusion of a small fan. These two sockets are here at the top are for plugging in this fan. The idea behind this is that whilst gaming you can 'cool off' your hands. It seems a bit of a gimmick to me, if you have problems with sweaty hands - then maybe a good suggestion is remove a layer? or go and see the doc?
Circular rubber cover
Tiny fan used for cooling sweaty gamer hands