Created for environments with certain security standards for communication and sound transmission, this cord enables an analogue QD headset to be used with a computer via the 3.5 mm TRRS jack with push-to-talk functionality. Suitable for use with PC devices only and is not suitable for use with mobile devices.Created for environments with certain security standards for communication and sound transmission, this cord enables an analogue QD headset to be used with a computer via the 3.5 mm TRRS jack with push-to-talk functionality. Suitable for use with PC devices only and is not suitable for use with mobile devices.