The ever popular HKLN4604 swivel earpiece mic (Formerly RLN6423) is Motorola’s most comfortable and most durable earpiece mic on the market! Especially designed for all day business radio use, the swivel earpiece mic was made with restaurants, hotels, stores and factory floors in mind. More than super comfortable and lightweight the RLN6423 swivel earpiece mic delivers the audio clarity you need in a loud work environment. We’ve asked our customers who are spread out across just about every industry you can imagine to test this earpiece mic for us and give us a report back on its job performance with their business walkie-talkies. Word in the field is this earpiece and microphone deliver and wear well all day. Customers say they also like the flip construction that allows them to switch ears for added comfort and flexibility in business radio applications.