E-PRIME Ace Manuel D'instructions page 15

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Charging
Fully charged, the earbuds will endure approximately 7 hours. If the
earbuds battery is nearly out, you will hear a notification. Shortly after the
earbuds will disconnect.
By placing the earbuds back in the charging case, the earbuds will
automatically recharge. If the earbuds are placed in the charging case, the
indication of the left and right earbuds on the (led display) will flash, which
means it is being charged. The charging case has a low battery if the led
display shows a low battery percentage.
The charging case can be charged by connecting the USB cable to the USB
port on the charging box, the digits in the LED display will show and blink.
It takes about 2 hours to fully charge the charging case.
It takes about 1.5 hours to fully charge the earbuds. With a fully charged
charging case, the earbuds can be charged 20 times. Storing the earbuds in
the charging case ensures that the earbuds are recharged for use.
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