The Caseta and Diva dimmers come pre-wired, making their installation in retrofit projects a breeze. Why RA2 (RRD-x) dimmers and switches come with the screws like any other ordinary dimmer? Installation of RA2 dimmers is time consuming and when you have a 3+ gang to install, none of them will ever be perfectly flush with the Claro Design faceplate. Here is why: most RA2 dimmers require a neutral, so on the back side of the dimmer you have three 14AWG wires screwed into one side of the dimmer. When you screw the dimmer to the wallbox, there is excessive pressure on that side of the dimmer. Then, imagine when you have a 3 or even a 5-gang installation with 3-way application: the amount of 14AWG wires in the wallbox is such that the dimmer will never be perfectly flush with the Claro faceplate. Reason is that you have three 14AWG wires exercising pressure on only one side of the dimmer, which causes it to angle on the horizontal plan. I had a 5-gang retrofit to install and it was a complete nightmare, not to mention none of the dimmers ended up completely aligned or flush with the faceplate.