it makes the enemy not to see there red name on top and doesent turn for u.

useful when your creeping around in a Ghillie suit, but other then that not that useful.

ok thanks
but is it worth it to get it

Up to you really. I did just for the sake of getting it but i don't really use it that
often, so it really depends on your style of game play. If your a grade A sneak then yeah,
its worth it.

4 those noobs who ask what perks do wen u go on it IT TELLS U. (unles u havnt unlocked it
which i dint remembr til half way thru writin this msg) which is prob why u all ask so yh
soz lol my bad

cold blooded pro is good because you can be able to play dead in a match and heres how to
play dead

-have cold blooded pro on then go prone(crouch all the way) then just keep on switching
your weapons(note this is useless is your radar shows where your enemys are)