?Which nokia lumia have led retroilluminated buttons?

[mildor]

I want to buy a new phone, a lumia one (i do not think i have enough money for 920)
520 It is a nice phone, but it is very cheap, and I notice that the screen is a little bad, in quality and little bad responsive touch
So... I notice the 520 do NOT have retroilluminated buttons (HOME, BACK AND SEARCH)

so, which lumia DO have these cool feature?

 

[LMZR]

I believe the Lumia 720 has illuminated buttons.

 

[gazmatic]

820 or ativ s

 

[WanderingTraveler]

I believe that the 52x line are the only WP8 Lumias that don't have illuminated buttons.