You know all those movie scenes where the hero must infiltrate a highly secure enemy facility? A normal person thinks something like this: "Oh, my goodness -- I sure hope he manages to get through all those lasers and motion detectors! He's the hero, and therefore I fear for his well-being!"
Geeks and gadget freaks, however, are more intrigued by the hero's high-tech spy gear. "Cool," we think. "He's in constant radio contact with his team in the unmarked van outside on the street, and yet I can't see any trace of a microphone, headset or cell phone. Wish I had technology like that!"
Well, now you do. At least two companies -- Sound ID and CallPod -- now make tiny, wireless earpieces that let you and an unseen buddy have a spoken, hands-free conversation. Invisible intercom, anyone?
One is called the SM100 (www.SoundID.com, $86). The other is the Dragon V2, just released (www.CallPod.com, $100). (There's actually a third contender, the Scala Rider from Cardo Systems, that's intended exclusively for motorcycle riders and must be screwed into your helmet. I couldn't test the Scala, though, because my editor refused to buy me a motorcycle.)
The SM100 is minuscule: a gray oval that nearly hides behind a quarter, with a microphone boom that's so small, it's more of a microphone wart. The whole thing weighs 11 grams, or four-tenths of an ounce; it wouldn't tip over a Barbie.
The Dragon V2 is slightly bigger -- it's a half-inch-thick circle, available in three finishes. It is also twice as heavy as the SM100, although at 25 grams it's not like it's going to result in a chiropractor visit.
All right, a confession: both of these gadgets are primarily intended to be standard Bluetooth cell phone earpieces, the type that make white-collar executives on city streets look like the...

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