If the installation of the first in a series of Jasco Z-Wave devices didn't intimidate you then this one might. Many of your lights in your home will be controlled by more than one switch; these are 3-way and 4-way circuits. In order to control these you need to get one or more of the GE Add On Switches. Here we have the Z-Wave GE 12728 In Wall Add On Switch (Toggle style) and the GE 12723 Add On Switch (Paddle style). Both are UL listed for use with 120V 60Hz circuits, mounted indoors with a temperature range of 32-104F (0-40C). They are also packed in the same type of box described earlier but as mentioned these have a gray stripe to indicate they are platform independent, so they can be used with ZigBee and Bluetooth as well.