Power Leads, or Flying Power Leads as they are otherwise known, can splice a camera connection directly into the power connection.  Essentially, it acts as an adapter to combine both the video feed and the power feed to your security cameras within your system.  These adapters make sure that you have a continuous flow of power and video without interruption while also cutting down on all of the cable running back and forth.  Flying power leads are available in a variety of configurations – Siamese cable to male plug, Siamese cable to female connector, etc.  Depending on your security system, these power leads can simplify your installation.