Can you show me that in the rules man? (Direct me to their location?)
I'm not trying to be difficult, but considering something as simple as a toaster has a matrix icon, I can't help but feel the Micro Transceiver would as well. Also, it would mean that the Technomancer's ability to interface with technology via touch (from submerging or whatever its called) would be completely pointless. Also, doesn't a matrix search show you all active icons and inactive icons?
If you can see in active icons then they have to be transmitting something, right?
Even if something is running silent and behind a firewall you are still only at -2 to pick it up on a Matrix Search. I think what you need is a Wrapper Program, to conceal the nature of the device.
I think the real benefit to the Micro Transceiver is that its cheap, easy to hide, and doesn't contain all your personal data or anything that can obscure your vision if someone tries to spam-bomb you.