1.Four levels of management: mother card, manager card, service card and guest card.
2.Mother Card: Only one mother card in the same system, to issue or cancel service card and guest card.
3.Manager Card: open all locks in the system.
4.Service Card: open locks in certain area.
5.Guest Card: open one certain room.
6.Usage options: service card and guest card open lock independently or have to be used together.
7.With low voltage indication and provided with power supply.
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