Suitable for:AnyTone AT-D868UV / AnyTone AT-D878UV / Anytone AT-D878UV Plus / AnyTone AT-D878UVII Plus Brand New and High Quality Two-pin standard diameter: Ear 3.5mm stereo (top pin), Mic 2.5mm stereo (bottom pin). Easy to use, Compatible with most radios with 2-pin K Mic Connector. Also works with other models of radios that use the same 2-pin configuration.