-Cable with male USB end
-12v computer fan
Strip the ends of the USB cord to revel 4 wires. Strip only the ends of the blue and green wires. Strip the ends black and red wires on the fan too. Solder the Green wire to the black one and the green to the red. Wrap electrical tape around the connections. Now wrap electrical tape all around the exposed wires. Plug it in to your computer's USB and Place on a vent on the router. This simple fan will keep it from over heating during long uses and will prolong its life.