Stack light (option/other) parts are used in combination with stack lights. These correspond to devices such as transmitters or receivers for data communication systems, brackets or poles for stack lights, and light source units. The transmitters and receivers are devices that collect data such as production conditions from the stack lights. These are used in locations such as factories and the communication range differs according to the object. Select according to the operating environment. Light source units often use LEDs that have a long lifespan and low power consumption. Various colors are available, such as red and blue. Brackets and poles are parts for mounting a stack light on a wall, floor, ceiling or other location. Because most optional products are used in combination with other items, the compatible models must be confirmed.