These devices are used indoors (ta 40°C) in places where emergency luminaries are needed. The luminaries GR-470, GR-472, GR-490 and GR-492 are suitable for corridors lighting and the GR-471, GR-473, GR-491 and GR-493 for open area lighting. Each device must be permanently connected to mains power supply. In normal operation the battery is charging. In case of a mains power supply failure, the device enters emergency mode and the illumination LED turns on. When the mains power supply is restored the device turns to normal operation.