STEP 1 - SWITCH TYPE
Option 1:  A Switch Module adapts to a regular light switch mechanism to create a wireless link for switching the lights.
Option 2:  Surface Mount Switch is a self contained wireless push button switch.

STEP 2 - DISTANCE/RANGE
Option 1:  Short Range, less than 15 meters, through one or two walls (Blue Unit).
Option 2:  Long Range, over 15 meters, multiple walls etc. (Orange Unit).