The Telex PH-44R is a very light-weight, binaural intercom headset with a dynamic, noise cancelling boom microphone, and a lightly padded adjustable headband, The semi-rigid gooseneck microphone boom is fully adjustable and easily positioned, and the earpiece features a moleskin covering for a comfortable and secure fit, The headset cable connector is a 4-pin XLR Male type, Very lightweight design, Adjustable, lightly padded headband, Noise-cancelling dynamic microphone on adjustable gooseneck boom arm, Comfortable and durable Moleskin covering for earpads, Frequency Range 300 Hz - 15 kHz, Microphone Type Dynamic, Noise-Cancelling, Mic Frequency Response 30 Hz - 10 kHz, Impedance 150 Ohms(Headphones), 200 Ohms(Microphone), Sensitivity (0 VU) Not specified by Manufacturer, Maximum Input Power Not specified by Manufacturer, Connectors 4-Pin XLR Male(A4M), Cable Length 6" (1, 8 m), SKU: TBALL9919