Rocker. For all buttons and handheld transmitters, we supply rockers in all button and handheld transmitter colors offered with laser engraving. For one arrow at the top (up) and one arrow at the bottom (down), the additional designation +2P is sufficient. For 0 (=off) at the top and I (=on) at the bottom, the additional designation +0I is sufficient. For I (=on) at the top and 0 (=off) at the bottom, the additional designation +I0 is sufficient. Other prints with a maximum of 6 lines must be described and we then engrave them in Arial font. A maximum of two lines each at the top, in the middle and at the bottom. If we receive an Adobe Illustrator or Corel Draw file with the extensions .ai or .cdr by email to LGI eltako.de, we can also engrave individual customer specifications. For bus buttons and bus flat buttons, the space for laser engraving is reduced by the LEDs.