Nauticam NA-D300s, Инструкция по эксплуатации

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7. Lock the port into place by turning the
port locking lever to the inward
position. To ensure that the port is
securely mounted, confirm that the
green line on the safety button of the
port locking lever is visible.
8. To remove the port from the housing,
simply turn the port locking lever to the
outward position and gently pull it out.