1.earplug headset for two way radio 2.noise-cancelling headset earhook3.radio headset 4.Noise-cancelling headset 1.The enviromental protection ear hanger made by TPE: Be flexible and don't hurt the skin.2.Clear sound quality,highly secrecy,and keep the external a quiet enviroment.3.Economic and practical,suitable for hotels,conference,enterainment security professionals