A. System Construction ORBITA set of locks, computer, management software, Encoder, IC card B. Multiple functions 1.Five levels of control: General control, building control, floor control, area control and room control. 2.Password control: System password and operating password together to ensure security. 3.Cipher coding to key card: Each card has a different code that cannot be copied. Compulsory decoding will destroy the card automatically. 4.Area control: Cards of different types and levels can open different locks in different locations. 5.Timing control: Working clock is set inside locks to control the effective time limit of card keys. 6.File record: All issued card keys have records including each opening(also mechanical key opening) 7.Loss reporting: Open function can be cancelled when the card is missed. C.Strong compatibility and expansiveness The system can be run above WINDOWS 3.1 operating system. In provided with strong expansiveness, it can link with the hotel management system. The system is in kind system interface which is easily operated.