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In-ear monitoring is a must for some bands, particularly on larger stages. These in-ear monitors use Bluetooth to communicate and are relatively cheap to buy and maintain.

For portable sound into your ears, these stereo earphones are available in basically two styles. In ear fitment and ear loop hook type. Do not be fooled by the compact size of these earphones, the sound quality has to be heard to be believed. Advanced features on selected products include in-line volume control.
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In ear monitors (I.E.M's) are flat response ear buds, designed to be easily concealed whilst still giving live musicians suitable audio monitoring during your performance.