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.
Chargers with an input range of 100 to 240 volts AC and adaptable plug sets work with both American and international power outlets, making travel more convenient.Dependable PerformanceRely on laptop adapters and chargers to provide the power you need to complete all of your work tasks in a timely manner.