[High-Quality Material]: This door lock is made of high-quality nylon plastic, does not rust, is well-made, has a smooth surface, and is durable. It can be installed directly on the nacelle or flush door by screw surface mounting. [Easy to Identify]: Green and red indicators are bright and easy to see, simple to install, suitable for partition doors. [Wide Use]: Suitable for public restrooms in airports, train stations, hospitals, shopping malls, and office buildings. Can also be used in toilets, locker rooms, and bathrooms to indicate whether the space is empty or occupied. [Unique Design]: This lock helps prevent knocking when closing the door. The vacancy indicator (green) and occupied indicator (red) clearly show the status of the toilet from a distance.