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.
This is a very convenient option if you typically carry your electronic cigarette in your pocket or purse. --6).Voltage Lock Down function to prevent accidental changing the voltage: simultaneously hold down â+â and â-â buttons 5 seconds to set and release. How to use eGo LCD Variable Voltage USB Passthrough battery: --1. On/Off: click the power button five times to turn on the battery and five times again to turn off the battery. --2. Set Output Voltage: 1), Output voltage range: 3.0-6.0 V, press â+â or â-â button to adjust the output voltage, 0.1V increments each time.