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.
Depends on your adapter. If it is a 65 Watt adapter(which most 15 inch laptops are), then maximum that it can use is 65 Watts. 17 inch laptops usually have 90 Watt adapters. There are many factors that determine how much it uses, like how powerful your graphics card is, CPU, etc. Estlander, Feb 25, 2009.