[. . . ] Please take some time to read carefully through this product information before setting up the equipment. [. . . ] It is common phenomenon to listen to music through headphones at high levels. The very low levels of distortion present within the headphone can make the listening levels higher than is perceived and we would like to warn you of this so that you are able to enjoy this headphone for many years without damaging your ears. Microphone socket Servicing must be carried out by qualified service personnel only. dismantling the microphone yourself will render the guarantee null and void. Note For applications in the broadcast and intercom area the necessary plugs can be mounted at the factory upon request. In order to avoid pop noise you should use the microphone with a pop screen. [. . . ] Use a damp cloth for cleaning using warm water only taking care not to allow any water drops into the transducers. [. . . ]