First and foremost, the thing that defines a mechanical keyboard is the key switch it uses. Most budget keyboards today use dome-switch technology, which registers a keypress when you type and push down a silicone dome and connect two circuit-board traces. (This technology is also sometimes referred to as "membrane switch" or "rubber dome," with minor variations in the essential design.) Though this style is easy and inexpensive to manufacture, pressing the keys requires a relatively large amount of force, which can result in a heavy, mushy feel to the fingers and a lack of either tactile or auditory feedback when you type. Plus, after a fairly "short" time (five million keystrokes, give or take), the domes can lose their springiness and either work less well or stop working altogether. So, you'll probably have to replace the keyboard at least once or twice over the life of the computer that you use it with.
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