When the earphone is playing, press the top spring switch to
rebound to high level to enter the pause state, press "+" key twice
to enter the delete state; press the "+" key twice to delete the
current file, press the "+" key three times to delete all files in the
current mode. (Red light and blue light will have long bright after
entering the delete mode. During deletion, the red light and blue
light will be off. When the deletion is completed, the blue light
flashes and then goes off. (Note: Please backup your file as it is
impossible to recover after delete. It takes longer if there is a
large number of documents to be deleted; After all the deletion of
document is completed, plug in the ear phone; and there is a red
light up for 5 seconds long, the blue light will light up for 3
seconds long. After that, the blue light flashes and then goes out.
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