I use it in a ski helmet to communicate with the ski patrol at a large ski resort. The sound is much clearer than tube earphones. The clamp/speaker unit is very uncomfortable on and around my ear so I had to tuck it into the padding of my helmet and now it's comfortable and still easily hear someone's voice. It would be nice if the speaker had a soft silicone surface for a soft-to-ear effect instead of the hard plastic currently used, and if the ear clip that wraps around the ear could be made narrower and softer.
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