the device will alarm the Postman to take letters or postcards as long as sb drop their letters or postcards ，the Postman will get message on the postal app.the postbox claims one taking daily，but fewer and fewer Chinese use postal service to message.some postal boxes in someplaces even have been empty for many years.so the frequency of opening may not be done as the open -daily claim on the box says.
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That’s really interesting! Thanks for sharing!
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Who dropped this bottle in it？
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it s a postbox in Beijing？
Yep, it’s in Shougang-- 2022 post office.
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Do cards weigh enough to trigger the alarm?
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