This series of door lock is making use of the IC card integrate circuit chips imported from German as a medium to open up the door.The chip inside the card is handled on with the 4442 encrypted chips of SIEMENS from German.It is of high capability to defend the counterfeit,as well as great security and comparatively cheap cost.Therefore ,it is the most widely used door locks with the most skilled technology.Because of the IC cards'capability of repetitious using,the IC card door lock is adopted by the hotels that need to use the customers'card repeatedly so as to decrease the using cost.