I didn't give my hotel room card to the bar. Can I open the door next time without paying?

You need to activate the license to continue using it.

The hotel room card represented by EM series chips belongs to the low-frequency card series, and has an ID card all over the world, and most of them are unchangeable, which can meet the sexual needs of hotel room cards: in the past, contact 4442 or 4428 chips were often used as the information carrier of room cards, because the door locks developed by door lock companies mostly used contact IC chips, but recently the inductive door locks gradually began to be mass-produced. The inductive IC cards that have been gradually used now are mostly Mifare series cards, that is, M 1 or M4 cards that are often used in the market.