Mijia smart luggage tag can keep connected with users. When the suitcase is lost or the user looks for the suitcase, the user can locate the suitcase on the mobile phone. The luggage tag ink screen can display user-edited information and contact the lost person as soon as possible. In addition, the ink bottle can synchronize the user's flight or train frequency information, and the user can clarify the basic information without repeatedly taking and placing air tickets and tickets when waiting for the plane and the train.