Titan Brand-Lapel Shoulder Remote Speaker Mic for Motorola HT-1000, GP-900, MX-838/1000, MTS-2000, XTS-3000&pound;&not;EF Johnson 51SL/5000/5100/7700 Series UHF VHF Portable Two Way Radios High quality louder speaker and microphone units provide clear audio communication Water-resistant Noise canceling microphone requirement acceptable Attached 3.5mm earphone jack on microphone atented demountable metal plate clip for meeting professional using.