Supplied with switch cover removed. It took a few minutes to match the micro switch. Once inside, it's difficult to flick the switch back and forth to turn the mic on and off. Applications are compatible with Polycom VVX 411. Echo is repeated with every call. Echo Removal could not be configured. The sound through the earphone was muffled and barely audible even at maximum volume. The only positives were that it was a comfortable headpiece and the flexible boom mic was easy to adjust.
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