- Walker's Push-to-Signal handsets are backed by FAA Contracts. - Noise Canceling available for those areas where background noise is very loud. - Push-to-Signal (PTS) Initiates radio signal transmission - The PTS is for radios, FAA, dispatch consoles or where 6-conductor cord is required. - K - Square shaped handset microphone and speaker - 6M - Female Modular Jack, RJ11 6-Wire. Cable not included - Microphone - Carbon compatible transmitter, standard - PTSK6M Color: 00 Black