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In the airport, the travelers always use the luggage trolley to carry luggages.
However,when you want to go to the toilet or duty-free shops, you can't find any safe place to lock your luggage trolley.
Trolley lock is a device to keep your luggage trolley safe all the time in the airport.
It is convenient and safe by the fingerprint scan to lock the luggage trolley.
The green light means vacant, and the red light means in use.
Taipei City, Taiwan
National Taipei University of Technology