LOB 8000 System The LOB 8000 series system offers all-round functionality that is required of electronic hotel locks. The range includes two types of locks, both of them available in stainless steel and gold colors (PVD coating). Apart from the guests' cards, the locking system also operates "master" cards, "always open" and "always closed" function cards. The lock features the "do not disturb" function which disables the room maid's card, and a function which indicates that the door has been left open. The 8000 system can be integrated with the building and reservation management software.