Set up your own coding system using colorful signals. The position and color of the signal flags can be used to designate which doctor is inside or status of each room (occupied, ready for clean-up, patient ready for lab or X-rays, etc.). Simply flick theappropriate flag as you enter or leave a room and the entire staff knows its status. Signals mount easily with 2 screws (included). Constructed of sturdy plastic. Flags are 7" long. 6 flag colors: Red, White, Green, Yellow, Blue, Black.