EARMOR M52 Tactical Headset PTT Adapter for ICOM Radio with Finger ButtonProduct Description: M52 PTT(Push to talk), is a method of having conversations or talking on half duplex communication lines, including two way radio, using a momentary button to switch from voice reception mode to transmit mode. Both headset and radio should be connected in order to use PTT. M52 PTT can be seamlessly integrated into your existing EARMOR M32 M32H Hearing Protector system or even the headsets of other verdors (MSA Sordin, 3M Peltor,