You may use it to control all special keyboard shortcuts that you see there (such as increasing or decreasing the volume, or toggling audio). Fn is the function key that enables the underlying functionality. You need to hold down on the Fn-key to access the special keys of the Surface keyboard. Or, to be more precise, that you press F1 or F2, and don't toggle the keyboard lighting functionality. If you just tap on the keys however, you will notice that nothing happens. The first two keys next to the Esc-key on the keyboard above, those with the function keys F1 and F2, control the keyboard backlight on the Surface device. You have controls however to toggle the backlight manually as well, but it may not be available on older versions of the Surface keyboard. The Surface keyboard backlight turns on and off automatically using the built-in sensor. Turning down the brightness of the display to 50% (16% longer battery life, turning it further own is less efficient).Removing mouse and keyboard peripherals (20%-30% longer battery life on a single charge).Other beneficial battery saving tweaks included: The guys over on Linus Tech Tips ran battery saving tests recently which concluded that turning off the keyboard backlight extends battery use before you need to recharge by about 16%. This is not much of an issue if the Surface device is connected to a power outlet, but if it runs on battery, you will notice that the lighting makes the battery drain faster. This is a useful feature as it helps you identify the keys on the keyboard which may be an issue in low-light environments. The Surface Pro ships with a sensor built-in that will activate the light on the keyboard to highlight the keys better.
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