The earpiece is made of durable PU material Walkie talkie earpiece headset with good performace for both listening and talking,prevent distortion of sound No distortion, attenuation or frequency jumps Clip this hands free earpiece onto your shirt and begin using your radio device to communicate discretely and easily Big size PTT and wearing gloves does not affect the key operation Compatible with the Hytera PD600, PD602, PD602G, PD605, PD660, PD662, PD662G, PD665, PD680, PD682, PD682G, PD685, X1e, X1p radio etc