The CR134 and CR334 are A10 enhanced powerline carrier coupler repeaters for distributing Powerline Control signals to all phases of power. Both have DIP switches that enable the user to customize their operation depending on the application.  Both are housed in a grey painted enclosure that is esigned to mount on a grounded 4-11/16" by 4-11/16" electrical box (provided by others) LED's in the cover indicate operational modes. Manufactured under Advanced Control Technologies, Inc.’s U.S. Patent No. 6,229,432.