Power Meter Plus Portable is for laptop for displaying how much power my battery had left. Power Meter Plus Portable gradually appears as the power levels drop. The lower the power, the more prominent the meter will be. When you're charging the laptop it'll turn green and slowly disappear/fade as the charge increases. Power Meter Plus Portable appears either on the bottom left or bottom right of the screen; it moves to the opposite corner if you move your mouse over it. A large message will appear when the laptop switches from mains power to battery (and vice versa).