Vacant or Engaged Indicator: This door lock is designed for toilets, restrooms, and bathrooms to indicate whether the room is vacant or engaged. The red color signifies engaged, while the green color signifies vacant. The indicator system is easy to recognize at a glance, helping prevent interruptions and confusion. Sturdy and antirust construction: Made of zinc alloy, this lock is durable and antirust. It features a smooth finish for a sleek, modern look and is built to withstand frequent use for longlasting performance. Easy installation and broad compatibility: The design allows for simple installation on a wide range of doors and bulkhead doors. It fits plates with thickness from 12 mm to 18 mm and includes all hardware for hassle setup. Applications and purpose: This indicator bolt is suitable for both residential bathrooms and public facilities such as airports, stations, hospitals, shopping malls, and office buildings. It provides a clear status indication, improving privacy and convenience. Use scenarios: Hotel guest room bathrooms indicate occupancy to guests and staff, reducing interruptions. Public restrooms in airports or office buildings minimize confusion and improve privacy for users. Cleaning and maintenance teams can quickly identify which rooms are in use or available.