DC Coupler DR-E5
By Canon USA

Power Coupler - Product Model: DR-E5 - Additional Information: Canon EOS Rebel XSi - - ... 

Model D3 PowerPhase Coupler
By Corinex

3 Pin Dryer Coupler - When the outlets in just one room or section of your house have a noticeably weak Powerline network connection, it may mean that those rooms are on a different circuit. The Corinex PowerPhase Coupler joins together the Powerline network frequencies from separate circuits. Simply plug in the coupler to extend your Powerline signal to the adjoining circuits. ... 

Model D4 PowerPhase Coupler
By Corinex

4 Pin Dryer Coupler - When the outlets in just one room or section of your house have a noticeably weak Powerline network connection, it may mean that those rooms are on a different circuit. The Corinex PowerPhase Coupler joins together the Powerline network frequencies from separate circuits. Simply plug in the coupler to extend your Powerline signal to the adjoining circuits. ...