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 color 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