[. . . ] Shure Sound IsolatingTM Earphones, built with balanced armature speakers, deliver a detailed soundstage free from outside noise. The powerful and stylish Shure SE earphones come with a detachable cable, adapters, a durable carrying case, and interchangeable Sound IsolatingTM sleeves for a comfortable and personalized fit. [. . . ] Warning:Do not push the earphone sleeve beyond the ear canal opening. Slide on a new sleeve so that it completely covers the barb and the nozzle. Caution: If the barb or any of the nozzle is exposed, the sleeve is not properly installed. To ensure proper fit and performance, use only sleeves supplied by Shure (unless using custom molded sleeves). Select an earphone sleeve that provides the best fit and sound isolation. Soft Foam Sleeves: Compress the foam sleeve between your fingers and insert into the ear canal. If you notice a change in sound quality, remove the sleeve and check the nozzle of your earphone. If nozzle is blocked, clear obstruction by using wire loop end of cleaning tool. Caution: When cleaning, do not force any object through the earphone nozzle!Any other use, such as using the tool to clean ears, could result in injury. Careful maintenance ensures a tight seal between the sleeve and nozzle, improving sound quality and product safety. â· Keep the earphones and sleeves as clean and dry as possible. [. . . ] Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments. Para asegurar un sello y funcionamiento correctos, use solamente mangas suministradas por Shure (a menos que use mangas moldeadas a la medida). [. . . ]