If forced, I’ve to state that I usually imagine a little old fella, like Desmond Llewelyn in the Bond films, (and even a younger example like Ben Whishaw from ‘Skyfall’) making all the devices himself after which explaining them to the agents before they go out and protector the President’s life.
This is simply not the case. They use the models they use as they work and they work well. Fundamentally, wired models continue to be more dependable than their wireless counterparts. With wireless, you tend to get more interference, as well as having to contend with more restricted bandwidth. Essentially, you will need reliable tech when you’re within the field. Lives are at stake in a number of cases.
This straightforward, trusted earpiece might be relied upon to do the job, every time.
Another benefit that wired earpieces have over wireless ones (in this instance, at the least) may be the fact that a wired set needn't carry an additional battery. Wireless earphones would require charging and, as a consequence, would have a somewhat limited operational capability. It just causes a lot more headaches for individuals who, let us face it, previously possess a good bit on their plates to start with.
According to ‘AskJeeves.com’
“The ear piece and mic that the secret service uses is called a Throat Mic. The Throat Mic has clarity that is unsurpassed, great sound quality, and allows for discreet interaction. It also has an acoustic air tube that makes it comfortable when worn for long periods of time”.
The ‘curly earpiece’ tech is really rather common and has been utilized by a number of individuals and organisations beyond the secret service. You can even purchase a wireless version, but don’t expect the FBI to be interested!
I might argue another point, but this is just a pet theory with very little research to back it up. Psychologically speaking, when you see a secret service agent, you recognize them as such without observing them in any form of uniform (beyond a dinner suit, sun glasses and an earpiece), the earpiece, then, is really a subtle reminder to, the civilian, that not merely is this not a regular person in a suit, but also that the area where you now end up is being closely monitored.
With one remark to his/her earpiece, the agent in question can probably call down all the other agents in the immediate area, as well as police, fire brigade and anybody else he/she believes is essential. That subtle reminder is probably a very potent crime deterrent. No guns need to be displayed, no helmets or flak jackets worn and yet y’know that this individual has eyes all over the place and will, probably, really ruin your month. As I said, it’s merely a assumption, but It looks like it makes sense.