LOB 5500 Adel System LOB 5500 Adel series electronic locks are an effect of several decades of experience in the field of design and production of reliable and robust products. The characteristic feature of the LOB 5500 lock is its exceptional build quality, which means that a single investment ensures many years of stable operation with low maintenance costs. LOB 5500 enables integration with external (PMS) systems using existing modules. A full range of distinctively designed devices allows the user to safeguard not only hotel rooms, but also boom barriers, garage doors and other passageways. LOB 5500 is an "overlay" system, which means than an electronic escutcheon with a blocking mechanism can be installed on almost any type of mechanical lock. A dedicated mortise lock can also be used to expand the system's possibilities.