Next, connect the base unit to an existing phone jack using six-foot phone cord (included); then connect the phone to the unused connector on the base unit. El iûm\ Wall Jack Base Unit 2. Plug the extension unit (single phone connector on right side) into an AC outlet where connection is needed. The indicator light on the extension unit will blink red. As soon as it recognizes the base unit, the indicator light will then illuminate green; the indicator light on the base unit will also illum