Hytera's Airtube earphone without vox.
List of compatible walkies
Hytera: AP515, AP585, BP515, BP565, AP515LF, AP525LF, BP515LF
Code: 04.2101.009
Code: 25.2101.055
Code: 43.2101.024
Code: 43.2101.057
Code: 25.2101.017
Code: 43.2101.014