Headphone has only one jack

Hello. I would just like to ask about my headphone jack in my new ThinkPad Edge E520. It has only one jack which is very unusual to me. I usually notice two jacks in most devices like this, one for the microphone and one for the earpiece I suppose. What I have in my mind is that maybe this jack has a dual function for both microphone and earphone. But I am having a 2-jack headset here. Can I still use this? Will it damage my device if I try plugging it there? I think I can use wireless headset but I prefer to use the wired one. Or is there some sort of adapter I could use? I don’t want to try plugging my headset because I’m afraid it could damage the jack. Any suggestions?
