I have been experimenting with the Radio Shack intercoms mentioned here. I was disappointed to find out that the VOX wasn't particularly sensitive from more than a few feet away. Also, when one intercom would transmit there was a "hang time" of several seconds until it could receive again, which really slowed things down and made voice commands difficult. I also wasn't thrilled about having to buy/obtain another sound card. Intstead, I settled (for now) for a reduced functionality that uses only one soundcard. I use one intercom (they come in pairs) solely as a receiver connected to the computer, and the other becomes my "wireless microphone" (transmitter). I was worried that I was basically installing a mic in my house for the world to listen in on me. Using a scanner I found the transmit frequency (about 910 MHz) and noted that the signal was somewhat "scrambled". I'm sure with the same intercoms or some effort someone could listen in on my day to day activities, but for now it's nice to know that the signal isn't "in the open." I lock the transmit so that it is always "listening" for voice commands, and when they are picked up they go from the "wireless mic" intercom to the receiver intercom, then into the mic input (NOT the line in connector) of the computer. Sounds being output from the computer line out go to a separate set of regular computer speakers but unfortunately do not get rebroadcast back to the other intercom (it can't transmit and receive at the same time anyway). I did tap into the speaker of the "receiver" intercom to get my output audio signal, and it works very well! I was surprised. I'm sure someone may have a better solution, but if you can solder and follow instructions it really isn't that difficult. If anyone is interested I am putting together a step by step on how I did this. While I hesitate to use the word "kludge" to describe this process it works very well, albeit I only have one "microphone", but augmented with remotes it works for me.