With a neutral, unmarked indicator sign measuring approximately 71 x 71 mm (overall dimensions approximately 71 x 142 mm). Operation only with power supply Art. No. SV 539 LED or SV 539-948 LED. For mounting on the power supply, the frame Art. No. LS 981.. (1 to 5-fold) or AL/ES/GCR 2981.. (1 to 5-fold) is always required. Connection to L, L’ and N or F1, F2 and ⊥ of the power supply. With RGB LEDs. The 3-pole DIP switch on the back allows you to set the following colors: red, blue, green, violet, yellow, light blue, white. We label LED indicator signs for you!.