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Crystal Acoustics BT4 User Manual page 3

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• Use the micro USB cable
which is included in the
package of the headphones.
• A different micro USB cable
might not be able to charge
correctly (or even not at all)
the battery of the headphones.
Connect:
• the micro USB plug
into the headphone's port.
• the USB plug
into any compatible USB device.
red
• While battery is charging
the indication light is red.
Charge it
blue
• When battery has been
fully charged the light
turns blue.
A full charge of
the battery takes
2h
approximately 2 hours.
The headphones are
automatically deactivated
during charging process.

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