Fire alarm systems need to be inspected, tested and tagged annually. Testing must include all smoke detectors, manual pull devices, annunciators, visual indicators and strobes, control units, voice/alarm communications systems and any other devices that are a part of the fire alarm system.
it will need a port like this one to get more power from the usb since it only give 5.0 volts and this powered usb give up12 to 24 volts so you dont have that in a laptop and there is no way it could raise the power on the usb port in a laptop without damaging something .http://en.wikipedia.org/wiki/Powered_USB.
1 A monitor with a supply from the wall can power, or charge, a laptop while still displaying. 2  USB power bricks or chargers are able to supply power through a laptops USB ports.  Laptops and USB power bricks can provide higher power to battery powered devices (not currently defined by USB).