[. . . ] The Comfort 112 Noise Cancelling are stereo headphones with active noise cancellation and suitable for use with audio systems in airplanes, stereo systems and portable audio devices. Loudspeakers with a diameter of 40 mm ensure a high-quality sound experience. [. . . ] Use the return and collection systems available to dispose of the old device. Do not discard any batteries in the household trash; instead, return them to the corresponding collection sites. Without batteries, the headphones can be used like passive headphones. Illuminates with switched-on noise cancellation U Switch off the noise cancellation before inserting the batteries. U Push the cover of the battery compartment on the right earpiece down and fold it up to open the battery compartment. U Close the cover of the battery compartment and push it up until it audibly engages. notes: · Take the batteries out of the battery compartment if you do not use the headphones for an extended period of time. ⷠThe batteries must be replaced if the power-on indicator no longer illuminates. Adjusting noise cancellation effect to the noise environment U Connect the supplied audio cable with the headphone jack of the left earpiece. 3-mm audio adapter with the audio cable before connecting the headphones with the audio source. [. . . ] KG declares that this product complies with the basic requirements and the other relevant regulations of the directive 2004/108/EC. Type Driver units Frequency range Impedance Sound-pressure level Active noise cancellation Cable plug Audio adapter Airplane adapter Cable length Weight without cable and batteries Power supply Operating time with alkaline batteries Subject to change! [. . . ]