[. . . ] We declare under our sole responsibility that this product, to which this declaration relates, is in conformity with the following standards: EN55013. [. . . ] â· When using headphones, for safety keep the volume to a level at which surrounding sounds can be heard. â· Do not place undue stress on the cable, as this can result in wire disconnection or damage. When connected to a portable device, do not leave the portable device hanging. â· The headphones have a structure by which the sound tends to leak out if the volume is too high. Check the left/right markings on the headphones, then insert them so that they fit snuggly inside your ear, the one marked R in your right ear, the one marked L in your left ear (vC). Adjust the position of the slider to take up any slack in the right and left cables (vD). [. . . ] If this is not the right size for your ears, replace them with the "L" (large) or "S" (small) ear pads (vE). [. . . ]