This accessory belongs to Modicon M171/M172 range of controllers. It is a battery backup for electronic expansion valve drivers, and should be ordered separately. It weighs 0.157kg. It measures 36mm wide, 110mm high, 60mm deep. It provides power when the primary source of power is unavailable. It is certified CE, UL, CSA, EAC, RoHS China. It is compatible with TM172EVEV1U TM172EVEV1B TM172EVEV2B electronic expansion valve drivers.