Advantages:
1, Five way unlock:  1) Password;  2) Single card;  3) Password + password;  4) Card + Card;  5) Password + card
2, Two working mode:
    1) Private mode: the lock keep locked, read the card/password to unlock it. The card/password need to be programmed on lock in advance. It is default working mode.
    2) Public mode: the lock keep unlocked, input the card/ password to lock it, then input the same card/ password to unlock. Then change another card/ password.
                                     The card/ password is one-time use. It is optional working mode. You can switch the mode on lock freely.
3, External power interface(Audio interface/ USB power supply)
4, Low voltage alarm;
5, Input wrong password/ card up to 5 times, the lock system will be locked for 5mins. 
6. Applicable to agent, school, SPA/sauna bath center, swimming pool, gym,golf course, supermarket, hotel, company, factory, household, business clue, etc