Zeadio Shoulder Remote Speaker Mic Microphone for 2 PIN Icom Cobra Maxon Ritron Vertex Walkie Talkie Radio Ic-f3, Ic-f3s, Ic-f3g, Ic-f3gs, Ic-f3gt, Ic-f4, Ic-f4s, Ic-f4tr, Ic-f4g, Ic-f4gs, Ic-f4gt Etc. Sold exclusively by Zeadio. Push-to-talk button and microphone are located on the accessory for quick and easy use. Great for noisy AND quiet areas because speaker is located right near user's ear. Radio can be placed anywhere with Microphone/Speaker conveniently located - wear it on your collar to keep the volume near your ear Built-in PTT and microphone is very handy Talk and listen without ever holding your radio.