Telex Airman Lightweight Headset 750, 150 Ohms, Flex boom, 3 year warranty

The Airman 750 weighs under four ounces, but it's no lightweight when it comes to performance. A miniature, amplified noise canceling 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. The Airman 750 is approved for aircraft use under Federal Aviation Agency TSO C57a and C58a; the Airman 76O, under TSO C57a. 

Headphones
Both units feature open-air style earphones for long-term, fatigue-free usage. The earphone housings are mounted on stainless steel sliders which permit over two inches (51 mm) of fitting adjustment. The ear cushions are removable for easy field replacement. 

Microphone 
The Airman 750 Headset features a miniature, amplified, noise-canceling electret microphone that provides superior 400 Hz hum rejection. The microphone boom is flexible for optimum microphone placement, and it is reversible for wearing on either side of the head. For best results, the microphone should be positioned as close to the mouth as possible. A position at one side of the mouth is best to minimize popping, hissing and breathing sounds when speaking. 

The microphone amplifier is contained in the boom-side earphone housing. The amplifier has an adjustable gain control and provides output levels equivalent to carbon microphone levels. (Adjustment by a qualified avionics technician is recommended.)