[. . . ] Open the rechargeable battery compartment and insert two AAA type rechargeable batteries, making sure their positive and negative (+ and ­) poles are correctly aligned. [. . . ] This is to comply with the current legislation on reduce the amount of radio emissions in the environment. Therefore, to ensure that this function is not accidentally triggered, we suggest that you set the television, audio amplifier or DVD/CD player headphone volume level at approximately half way (50%). Please consult your equipments user manual for details on how to set the head / earphones volume level. 5mm audio jack and plug it the "headphone" socket of your audio appliance (amplifier or other device). Switch on the headphones and make sure the running light comes on; this confirms that the rechargeable batteries contain power. Turn the volume down on the headphones before putting them on your head; once you are wearing them, adjust the volume to suit. [. . . ] 2 V rechargeable batteries If you encounter difficulties, advisors are at your disposal to help you solve your problems at this telephone number. [. . . ]