Flat Tact Switch (without hand feeling)——The contact surfact does not adopt any secondary technologies.
Advantages: The keystoke life is more than 2 million times and the contact area is large.
Disadvantages: monotonous; no hand feeling; result in operation errors easily.
Disadvantages: The shrapnel may be damaged, which could cause a short circuit or not rebound so that it cannot be re-assembled when there has little bumps on lining plate or the arc shape of the plate is in a wide curve.