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.
Check to see if your specific Dell laptop model has an S-Video port, VGA port or DVI port. Check the ports on the back of the external device to which you want to connect, such as an LCD monitor or television set, and find out which type of port it uses. Acquire a corresponding cable. Connect one end of the cable to the port on the Dell laptop and the other end to the port on the external monitor.