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 Enter your model number to make sure this fits.  NOTE: Please make sure to connect the product to USB port of laptop. If connected to a USB hub or extension cords, it may not recognize the Driver or read the CD/DVD. For the desktops, please connect it to the USB port of the motherboard for normal use. While using the product make sure the power supply is normal, and connect the power cord to use at the same time.