Detectives, military personnel and law enforcement officers will love this item. No-one can tell if you are using a radio. This item is also popular in Hotels, Sports Arenas and Casinos.
The special transducer (in the ear plug) is worn in the ear. You actually speak and listen through this transducer or through your ear. It enables you to talk and listen covertly without having to remove the radio from your belt and without putting something near your mouth to talk. Imagine during a covert operation, you have to continuously move your hands/arms up and down to place a mic (no matter how tiny) near your mouth! Your movements are attracting your target's attention!!! BE PENNY WISE POUND FOOLISH AND YOU RISK EXPOSING YOURSELF DURING CRITICAL / DANGEROUS AND COVERT OPERATIONS.
This is how it works.
When you hit the PTT button, the ear plug/transducer instantly becomes a microphone. The supersensitive transducer picks up the slightest vibrations inside your ear canal, amplifies and converts it into signals suitable for transmission by your radio. Surrounding noise outside the ear will hardly be transmitted, ensuring that your buddy hears you clearly and not your surroundings' noise.
When you release the PTT button (you can hide it under your sleeve all the time), the ear plug/transducer unit becomes an earphone or speaker, delivering crystal clear sound that only you can hear.
Another great advantage of this item (unlike competitor's) is that it DOES NOT REQUIRE ANY BATTERY NOR INTERFACE BOX, which may get in the way. If you really want to be conspicuous at all time, this is it.
Comparable item is sold at $115+ excluding S/H.