Clear quality; impedance of ear piece for walkie-talkies is about 32Ohm15%; low impedance provides clearer sound quality for the communicator ^^ Coil tube design; the length of the wire can be stretched according to actual needs; radio earpiece can be used by people of different heights in the team ^^ In-ear earplug; two-way radio headset provides clear and concealed calls; suitable for leat or right ears to wear ^^ Double cable design; ear piece for walkie-talkies more convenient to wear; the length from the earbud to the PTT is about 20.28 in; the length from the PTT to the pin is about 35.82 in ^^ K head 2 pin; 2 way radio headset compatible with most 2 pin two way radios; such as Retevis RT22 RT21 H-777 RT68 RT19 RT22S H-777S RT27 RT28 two way radios; compatible with Baofeng UV-5R 888S Arcshell Kenwood Pxton Samcom Two Way Radio etc