The device is suitable for the continuous indication of voltage being present on bus bars and other equipments having nominal voltage of 10-36 kV. Its use is recommended for outdoor and indoor armored equipments, protected against moisture.The presence of voltage is indicated by a flashing light. It has no internal power supply, so its lifetime is unlimited.The device can be applied in a de-energized status, if the de-energizing was performed previously according the specifications.