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dahut said:Headphones do severla things....
1. Isolate outside noise from interfering with your efforts.
2. Isolate detector noise from the outside world.
3. Deliver audio to your ears so you know whats going on.
4. Conserve battery power.
The Calrad/Eagle/Royal/El Cheapo's do all of these things. They also have a stereo-mono, switch as some detectors - even today - still come with a mono audio output.
They are also unneccessarily heavy, bulky and hot. I prefer the in-ear digital style, or in a pinch, the head band studio types that Steve mentions. These give a much better audio resonse in terms of crispness, IMHO. And they are much easier to use and thus live with. But I use the Calrads, still, especially when it is cold outside.