This listing is for 1 Lutron Grafik Eye GXI-3504 Integrale.  This item is brand new old stock with some of the documentation missing. This is the creme de la creme of Lutron's Grafik Eye range. It has ballast control built in for controlling 0-10v etc and is compatible with home automation systems to control zone intensity directly by percentage (which the 3104 cannot do). 

Here is a link to a description of the model  http://www.onidserv.com/lutronshop/product/61/lutron-grafik-eye-integrale-gxi-3504-4-zone-lighting-control-system/lang/en

Please see my other Lutron listings on my items for sale.