Ditto to Ed"s comments.
Ive installed 67 systems in the past three years.
The 24btn keyset model number 3516-71 is a blue back lit display key set which would go very well in a restaurant environment.
Matter of fact i only sell the 3516-71 lighted display keysets as i feel it has a professional appearance to the display, making it very easy to read in dim lit area.
Your friend would be very please with that setup