Answers: microphone is pink speakers is green
if this does not back plug surrounded by speakers contained by any jack and play some music if you hear it from the speaker the other jack is the microphone jack otherwise the jack you attached the speaker to psyche the microphone jack. This wont spoil your speaker
Besides the color, which as lot of ppl already said is any Red or Pink, you can look at the jack with care. Most of the jackss will enjoy the wording "MIC" embossed or small picture of a Microphone:
For more detailed information you can look at this webpage:
http://www.uas.alaska.edu/sitka/idc/ellu...
This probably is the complete guide for a mike and i am sure will resolve all ur query..
Hope that help..
Happy recording/voice chatting... :)
pink