Fanvil CL-01 is a medical tri-color corridor light that utilizes the 485 protocol for communication and is compatible with Fanvil Y501/Y501-Y series healthcare intercoms. It is primarily installed at the entrance of patient rooms and can display three colors: red, green, and blue. This functionality allows for precise indication of various call levels, aiding medical staff in swiftly identifying room status and enhancing overall efficiency and safety in medical operations.