YADA hotel lock integrate advance electronics and precision manufacture, it includes: 1) Computer: PC with a serial port at least 2) Software: issue and administrate the smart card, three administrate class according to priority 3) Lock: installed in guest door or in entrance of floor, or at gate to open and close the door 4) IC card: to open and set the lock 5) Encoder: read and write the card with PC software 6) Option: energy saver Features: 1) Elegant surface processed by special advanced techniques, making it durable 2) Designed according to international standard 3) German Siemens 4442 encrypted card, it is highly safe and reliable 4) Storing the last 100 unlocking records