YK-668 is a new generation standalone access control keypad equipped with Card reading, Card+ code, and code entry models all-in-one, buttons are made from hand-machine craftsmanship, with blue colour fade-proof back light. Operating systems are developed from newest Micro-controller Core, bringing the keypad high stability, huge capacity, strong performance, quick reaction and easy operation, making it best choice companies ,factories, intelligent communities , office buildings electrical control etc project