Replace mechanical keys that can easily be copied and cause expensive re-keying when lost, with this award-winning, active RF-based, transponder. With a push of the button you can unlock doors and control a wide range of equipment as authorized by the system administrator. If the transponder is lost or stolen, it can easily be disabled and a replacement issued without the expense of mechanical changes to the lock. In fact, one transponder can be programmed to provide different levels of access at different times of day across multiple SimonsVoss lock systems. This may be the only "key" you need.