Tenq Heavy Duty 2-pin Shoulder Remote Speaker Mic Microphone PTT for Motorola Radio Mu11cv Mu12 Mu12c Mu12cv Mu21c Mu21cv Etc Talk and listen without ever HOLDING your radio! Push-To-Talk button and microphone are located on the accessory for quick and easy use. 2.5 mm jack for external listen-only earpiece earphone. A strong swivel retaining clip on the back for convenience. Heavy duty and Compact Design.