I'm not sure exactly what it is using. I've never dug into it that much (literally or Googlally - yea that's a new word). Joe Yigit Turgut wrote: >=20 > Joe, >=20 > Your wireless speaker mic is probably using the far-field.Surely it would > work when it's very close to the receiver but what makes it tick is the > far-field if it has an analog transmitter/receiver. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .