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.
It tells you that your appliance will handle up to 240 volts. In other words, it will handle any voltage in the world, it does not need a converter that will step the voltage down from 240 to 120 volts. Most modern electronic stuff is that way these days; especially laptops.On laptops, you will see something like the red-underlined phrase on the brick or laptop power supply.t tells you that your appliance will handle up to 240 volts. In other words, it will handle any voltage in the world, it does not need a converter that will step the voltage down from 240 to 120 volts. Most modern electronic stuff is that way these days; especially laptops.