They make a short cord to plug the alarm system transformer into so it does not block both sides of the receptacle.
Here is one: http://www.proacousticsusa.com/products_big_print.php?pId=10565
But buy it a Walmart, they sell a 3 pack of them for about $5, in the electrical extension cord area.
Here is one: http://www.proacousticsusa.com/products_big_print.php?pId=10565
But buy it a Walmart, they sell a 3 pack of them for about $5, in the electrical extension cord area.