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Button labeled 'A' to play the previous track.
Button labeled 'B' for power, play/pause, answer/end calls, and Bluetooth pairing.
Button labeled 'C' to play the next track.
LED labeled 'D' indicating status, typically blue and/or red.
Button labeled 'E' to increase the volume.
Button labeled 'F' to decrease the volume.
Port labeled 'G' for charging the headphones via USB.
Component labeled 'H' for voice input during calls.
Jack labeled 'J' for connecting an optional stereo cable.
Feature labeled 'K', the headband is adjustable and foldable.
Instructions for connecting headphones wirelessly via Bluetooth or using a wired connection.
Guide on how to charge the built-in battery before first use and subsequent charging times.
Steps to pair the headphones with a Bluetooth-enabled device for wireless audio.
Summary of common operations: power, volume, playback, and call management.
Guidance on proper disposal of the product, following environmental regulations.
Details on R&TTE and FCC Class B compliance for the headphones.