It is generally not recommended to use electronic devices or chargers purchased from duty-free stores before boarding a flight, as they may not be compliant with the safety standards of your destination country.

If you open and use the charger before your flight, and it is found to be non-compliant during security checks at the airport, it could be confiscated or you may not be allowed to board your flight.

It is best to keep the charger in its original packaging until you arrive at your destination and have a chance to confirm that it meets the safety standards of the country you are in.
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