Can anyone please recommend a wireless lapel mic for connection to a PC? We have a conference room with a smart board (touch screen) and a decent video camera with in-built mic. However the in-built mic is not up to the task where the presenter is moving about the room. I need a lapel mic which will wirelessly connect to the computer either via USB or via the device plugged into the mic port on the computer. Range 10-15 m.