Polk Audio has brought out three new headphones. What is so special about them? You could say that these are the first Android only headphones. Yes, works only with an Android device. The headphones that we are talking about are the 3000a, 2000a and the 1000a. The models are part of the “UltraFit” line and have an “a” in the model name to indicate their functionality. All three come only in a green and black colour combination. These headphones are priced between $70 and $100.