The one key system is designed to reduce the number of keys that you need to carry around with you. If you have a property with several external doors why carry around a heavy bunch of keys when one will open the lot!!! Also you won’t have the hassle of trying to find the right key late at night when trying to get in. No more colour coding. If you have more then one entrance door and you would like to operate them with one key only please call for free advice and a quote.