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.
There are two different types of DVI ports your laptop may have: DVI-I or DVI-D. DVI-I carries digital and analogue signals, DVI-D just digital signals. You can connect any single-link DVI cable (DVI-I as well as DVI-D) to a dual-link DVI-I port. You can also connect a single-link DVI-D cable to a dual-link DVI-D port.However, you cannot connect a single-link DVI-I cable to a dual-link DVI-D port.(Source and further information).ou can connect any single-link DVI cable (DVI-I as well as DVI-D) to a dual-link DVI-I port. You can also connect a single-link DVI-D cable to a dual-link DVI-D port. However, you cannot connect a single-link DVI-I cable to a dual-link DVI-D port. (Source and further information).