What is control talk on Dr Dre beats?

ControlTalk lets you change the volume up and down using the up and down buttons respectively, press the centre button once to pause or play, press the centre button twice to skip to the next song, press the centre button twice and hold to fast forward, press the centre button three times to go back to the beginning of the song or go to the previous song, press the centre button three times and hold to rewind, press and hold the centre button to activate Voice Control on newer iPod Touches and iphones or Siri on iphone 4S. ControlTalk also has a microphone on it and you use it to talk when calling someone.