Unlike conventional locks where if the keys are lost you have the expense and inconvenience of replacing all the affected locks and keys – with the Haken HDL RG24 self programmable system you just delete the missing key from the system and issue a new one to the user. It’s that simple. If you want to add new users or delete existing ones you can do so at any time. All you have to do is present the programming key once to the reader followed by all the user keys that you want to operate or delete from the Lock. If a user key is lost it can still be quickly and simply deleted from the Lock just by touching the shadow card of the user key to the reader. The user key related to the shadow key used is then deleted, while all other user keys remain valid.