The 5x5 Pro III is a single receiver headset that provides true lightweight comfort with soft head-pad cushions, adjustable headband, and on-the-head weight specs of only 3/4 oz. Single receiver features single pliable, soft ear tip receiver. High quality electret microphone has flexible boom, which can be worn on left or right side. It can be worn without the headband, by clipping to eyeglass bows or aftermarket custom earmold. Order Push-to-Talk switch for aircraft that is not equipped. FAA TSO C57 & C58 Approved.