The Motorola RLN4941A single wire listen only ear piece is the first choice for many people who want discrete communication. The RLN4941 has a clear ear tube that helps to keep the unit virtually undetectable. There are several options including mushroom tips, small medium and large ear molds that are available. This gives you the ability to choose what is the most comfortable for long wear. There is also several replacement brands available but only one brand that we have tested held up to the quality of the Motorola Original RLN4941. Command Tac RLN4941 out lasted the Motorola Original in our field testing. We have also found that the Command Tac RLN4941A comes with an extra ear tube included at about a third of the cost.