The Airman 750 weighs under four ounces, but it's no lightweight when it comes to performance. A miniature, amplified noise cancelling electret mic provides superior 400 Hz hum rejection. Flexible boom pivots to either side of the head. Stainless steel headband has overhead cord, and dual dynamic receivers include replaceable cushions that gently hug each ear. Order Push-to-Talk switch for aircraft not so equipped. FAA TSO C57a & C58a.