Earhook converts from over-the-head to over-the-ear use. All models available with voice tube or noise-canceling microphone. Reduces background noise and incoming loud tones while enhancing call clarity. Compact, lightweight headset with superior acoustics and sound reception. Quick Disconnect™ lets you leave your desk while the caller remains on the line. Adjustable clothing clip. For either ear. Amplifier (sold separately) is required for operation.