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Secure your office premises by installing the MyKey 2300 RFID Door Lock. It uses Radio Frequency Identification (RFID) technology in place of standard door lock and metal keys. For $300, you get the MyKey 2300 and six RFID cards. All you need to do is to wave your RFID card at each doorway in order to unlock the door in front of you. It uses 40-bit encryption for greater security. Each MyKey 2300 comes with a built-in terminal that allows one to recharge it with a 9V battery in case it runs out of juice. Additional features include a hidden slide-out keypad, a built-in alarm system, and auto-lock features that aim to minimize tampering while maximizing security. Best of all is, there is no need to remember any more dumb PIN numbers or codes.

Pros : More secure and convenient than conventional locks
Cons : Expensive

MyKey 2300 RFID Door Lock Source