Electronic hearing protection will have a built in microphone and speaker system.
One of the reasons I went with the liberators is because they have two mics so you get stereo sound, with an option to amplify their sensetivity. It's quite neat, you hear every rustle, but the system won't allow any normally loud sound (yelling) to over-amplify.
Those units also:
-relay in communications from whatever radio you plug in
-transmit via the boom mic (none of that sleepy-dove stuff where you tuck your face into your shoulder)
-provide hearing protection (not a big deal for airsoft, but real steel its a necessity as far as I'm concerned)
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