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12138. Q: What do I do if Bluetooth can not close or open?A: Please note that ANC and Bluetooth are indicated by the same LED indicator light(but different light color), with a green light for ANC and a blue light for Bluetooth. If you need to turn Bluetooth on/off,you can turn off ANC firstly in case that you make confused by the color lights.But you will be very familiar with the light color meaning after using few times because it is simple and easy.11. Q: Why does audio quality become poor on Windows PC?A: This is one of our special features. When users insert an audio cable into headphone audio port, all Bluetooth feature buttons stop working and Bluetooth turns off. But,Bluetooth will be available again when audio cable is moved.10. Q: Why can't I turn headphone on/off?A: Some customers have mentioned poor audio quality on Windows PC.Please note that there are “Headset” and “Headphone” modes you can toggle by changing your output device.Selecting “Headphone Mode” will drastically improve the audio quality.”Headset Mode” is designed for highly compressed VOIP calls,etc.That’s not the fault of headphone product,that’s just the limitation of that protocol.If you are in “Headphone Mode”,the audio quality is fantastic.9. Q: Why does Bluetooth turn off when I connect an audio cable?A: Please reset Bluetooth function of headphone by inserting an audio cable into headphoneaudio port,then removing it.Before re-connecting,kindly remember to delete/ignore headphone Bluetooth pairing name NC85 on your mobile phone.FCC Caution:Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:—Reorient or relocate the receiving antenna.—Increase the separation between the equipment and receiver.—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.—Consult the dealer or an experienced radio/TV technician for help.IMPORTANT NOTE: