You should plug in your headphones so only you can hear the sound., You are in a library and you want to watch a video, but you don't want to disturb the people sitting next to you., You should connect a portable bluetooth keyboard to your phone to type easily., You are trying to type a long email on your smartphone, but your fingers are too big for the small buttons on the screen., If your laptop has a touchscreen, you can just use your finger to click on the icons!, Your laptop mouse is broken and you cannot move the little arrow on the screen..

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