Professional Heavy Duty Shoulder Remote Speaker Mic Microphone PTT for Hytera Radio PD790 Ex PD780 PD700 Professional Heavy Duty Shoulder Remote Speaker Mic Microphone PTT For Hytera Radio PD790 Ex PD780 PD700. Talk and listen without ever HOLDING your radio! Push-To-Talk button and microphone are located on the accessory for quick and easy use. A strong swivel retaining clip on the back for convenience. Heavy duty and Compact Design. Compatible with Hytera Radio two way radios walkie talkie PD790Ex, PD780/PD780G, PD700/PD700G, PT-580, PT580H