It uses text-to-speech algorithsms in Narrator, the program that Windows uses for text-to-speech. On many older systems the default voice was "Microsoft Sam" but most machines Vista and onward have started to default to "Microsoft Mary" instead.
I woke up and went into the kitchen, it was pitch black and I was paranoid. So I got a sharp cutting knife and tried to walk back into my room, but of course someone was behind me. When they went "BOO!" I screamed and just started slashing away.
I know my way around the kitchen, plus I can almost see perfectly in pitch black, I can see bright colors easiest, which the handles of the knives were.