The reason of disordered access key chain.

1. Access cards are often placed with mobile phones, bank cards and other items. After a long time, they are easy to demagnetize and the card will be invalid.

2. The access card is flooded or hit by gravity, resulting in damage to the internal chip. Generally speaking, at this time, the access card data has been completely damaged and the card will be invalid.

3. When the access control system fails or the wiring is unreliable, the access card will also fail.

4. If the data of the access control system is lost, the access card will also be invalid.

If there is no electricity at the gate, the access card will be invalid, but this is not the problem of the access card itself, but an external problem.