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.
A USB port, or universal serial bus, establishes communication between external devices and the host controller. A USB can connect peripherals, such as storage units or keyboards, to your computer. Originally created with a 1.0 specification, the USB has grown throughout the years. The 2.0 specification provides a higher data transfer rate than its predecessor. Many computers offer at least one version of both ports. Locating the 2.0 USB port on your computer can be tricky. The first step is to confirm that you have a 2.0 USB then identify and mark it. credit: Creatas Images/Creatas/Getty Images.