RTS PH-1R Single-Sided Headset with Flexible Dynamic Boom Mic for RTS - 4 Pin XLRM connectorThe Telex PH 1R is a medium weight, single muff RTS intercom communications headset. The PH 1R features foam filled cushions offering a light feel and moderate isolation from ambient noise, and an adjustable, dynamic noise canceling mic mounted on a continuously pivoting ball joint boom. The microphone may be easily positioned on either side of the head. The cable connector on the PH 1R is available as a 4 pin, XLR Male type. Features Noise cancelling