Abstract: A device for illuminating numbers being connected to a conventional low voltage transformer, preferably, across the contacts of a typical switch (momentary type). When the switch is closed, the short circuit bypasses the device's load (low power consumption) to activate the annunciator. The device includes a bracket assembly that slidably holds one or more number or letter assemblies. Opposite electrodes are positioned on the front of the bracket assembly in the upper and lower parts thereof and in cooperative electrical contact with the L.E.D. circuits defining those numbers or letters through contact pads disposed in opposite corners of the numeral or letter assemblies.